Visual Basic.NET - MANEJO DE CADENAS HTML

Estimados buenas tardes espero su ayuda.

Como puedo quitar a una cadena en formato html el dato por ejemplo:
(en la estructura de la tabla html sobro quiero quedarme con "012574663.ORI" = </td><td nowrap>012574663.ORI</td>)

estructura completa:

<style>
.blood0 {background-color: #FFFFFF;color: #000000;font-size:18pt;font-weight: bold;font-family: Courier New;vertical-align:
middle;text-align: left}
</style>
<DIV class="blood0">REPORTE ANÁLISIS DE ORINA</DIV>
<br>
<table border="0" cellspacing="0" cellpadding="1" width="60%" >
<tr>
<td nowrap>Nombre laboratorio : </td><td nowrap>Please&nbspfill&nbspit&nbspin&nbspSETTINGS/Maintenance&nbspmenu&nbsp!</td>
</tr>
<tr>
<td nowrap>ID muestra : </td><td nowrap>012574663.ORI</td>
</tr>
<tr>
<td nowrap>Rack : </td><td nowrap>4</td>
</tr>
<tr>
<td nowrap>Tubo : </td><td nowrap>1</td>
</tr>
<tr>
<td nowrap>Nombre paciente: : </td><td nowrap>-</td>
</tr>
<tr>
<td nowrap>Fecha y hora : </td><td nowrap>30.05.2014 5:38:16 PM</td>
</tr>
<tr>
<td nowrap>Resultado sedimento general :</td><td nowrap>-</td>
</tr>
<tr><td nowrap>Resultado químico general : </td><td nowrap>-</td> </tr>
<tr><td nowrap>Sedimento medido por : </td><td nowrap>Service</td> </tr>
<tr><td nowrap>Química medida por : </td><td nowrap>Service</td> </tr>
<tr><td nowrap>Validado por : </td><td nowrap>Validado automáticamente</td> </tr>
<tr><td nowrap>Enviado al LIS por : </td><td nowrap>-</td> </tr>
<tr><td nowrap>Exportado por : </td><td nowrap>Service</td> </tr>
<tr><td nowrap>Impreso por : </td><td nowrap>-</td> </tr>
</table><br>
<table border="1" cellspacing="0" cellpadding="1" width="50%" >
<tr><td nowrap align="center"><b>Partícula</b></td>
<td nowrap align="center"><b>Categoría</b></td>
<td nowrap align="center"><b>p/HPF</b></td>
<td nowrap align="center"><b>p/µl</b></td>
<td nowrap align="center"><b>N°</b></td>
<td nowrap align="center"><b>Ref. (p/HPF)</b></td>
<td nowrap align="center"><b>Modificado</b></td><tr>
<tr><td nowrap align="left"><b>RBC</b></td>
<td nowrap align="center" >0 - 1</td>
<td nowrap align="center">0.10</td>
<td nowrap align="center">0.44</td>
<td nowrap align="center">0.07</td>
<td nowrap align="center">0 .. 1</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>WBC</b></td>
<td nowrap align="center" >0 - 1</td>
<td nowrap align="center">0.20</td>
<td nowrap align="center">0.88</td>
<td nowrap align="center">0.13</td>
<td nowrap align="center">0 .. 1</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>CRY</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>.CRY</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>.CaOxd</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>.TRI</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>.URI</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>.U-AMO</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>.P-AMO</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>HYA</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>PAT</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>EPI</b></td>
<td nowrap align="center" >+</td>
<td nowrap align="center">0.60</td>
<td nowrap align="center">2.64</td>
<td nowrap align="center">0.40</td>
<td nowrap align="center">0 .. 5</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>YEA</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0.00</td>
<td nowrap align="center">0 .. 0.9</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>BAC</b></td>
<td nowrap align="center" >No hay</td>
<td nowrap align="center">14.70</td>
<td nowrap align="center">64.68</td>
<td nowrap align="center">9.80</td>
<td nowrap align="center">0 .. 29.55</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="left"><b>MUC</b></td>
<td nowrap align="center" >no hay</td>
<td nowrap align="center">3.90</td>
<td nowrap align="center">17.16</td>
<td nowrap align="center">2.60</td>
<td nowrap align="center">0 .. 60</td>
<td nowrap align="center">No</td>
</tr>
</table> <br>
<br> <table border="0" cellspacing="0" cellpadding="1" width="40%" >
<tr>
<td valign="top">Comentario : </td><td wrap valign="top"></td>
</tr>
<tr>
<td nowrap valign="top">Factor de dilución : </td><td nowrap valign="top">1.0</td>
</tr>
</table> <br>
<table border="1" cellspacing="0" cellpadding="1" width="40%" >
<tr><td nowrap align="center"><b>Pad</b></td>
<td nowrap align="center"><b>SI</b></td>
<td nowrap align="center"><b>Conv.</b></td>
<td nowrap align="center"><b>Arbitr.</b></td>
<td nowrap align="center"><b>Modificado</b></td></tr>
<tr><td nowrap align="center"><b>BIL</b></td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>UBG</b></td>
<td nowrap align="center">norm
</td>
<td nowrap align="center">norm
</td>
<td nowrap align="center">norm
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>KET</b></td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>ASC</b></td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>GLU</b></td>
<td nowrap align="center">norm
</td>
<td nowrap align="center">norm
</td>
<td nowrap align="center">norm
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>PRO</b></td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>BLD</b></td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>PH</b></td>
<td nowrap align="center">7.5

</td>
<td nowrap align="center">7.5

</td>
<td nowrap align="center">7.5

</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>NIT</b></td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">No</td>
</tr>
<tr><td nowrap align="center"><b>LEU</b></td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">neg
</td>
<td nowrap align="center">No</td>
</tr>
</table><br>
<br> <table border="0" cellspacing="0" cellpadding="1" width="40%" >
<tr>
<td nowrap valign="top">SG : </td><td nowrap valign="top">1.016</td>
</tr>
<tr>
<td valign="top">Turbidez : </td><td wrap valign="top">Transparente</td>
</tr>
<tr>
<td valign="top">Color : </td><td wrap valign="top">Amarillo</td>
</tr>
</table> <br>

Debes leer el archivo como txt

Leer las líneas de texto
por cada línea leina checar si contiene la palabra id
cuando se encuentre la palabra id
almacenar esa línea

leer la línea almacenada y checar cuando encuentre un numereo extraer toda esa línea desde el numero encontrado hasta el final

Y si ya sabes la posición dodne aparecerá siempre ese dato solo es indicar la posición
y si ya sabes la longitud que tendrá siempre un numero será mas fácil

inténtalo y me dices