The RTL8139 is a very well-known chip and seldom gives installation problems.
The usual reason for this kind of thing is that a plug and pray ID conflict
exists, in orther words a manufacturer (other than Realtek) has released a
product with an unauthorised ID which matches that of a known device.
You need to go into the \windows\inf folder, identify the .inf file which is
(wrongly) identifying this as a soundacard, and remove (or rename) that file.
In case this looks like a hopeless task, there are three clues:
Additions are usually named OEMxx.INF where xx is anumber.
Recent installs will have a recent file date.
You can search for any identifier-strings that the PnP detection gave you
for the
(alleged) soundcard.
Once you've removed the offending .INF, remove the Device Manager entry,
and perform a hardware detection. Windows should now say "I sdon't know what
this card is, please tell me" at which point you can supply the Realtek
driver.
