I have run a Hijackthis 1.99.01 log an am willing to post
If you do, don't post it here - post it in the HijackThis forum
. Read this
But meanwhile, your problems may not have anything to do with malware.
Chances are the new PCI adapter isn't set up to function. Did it come with any software? Problem is, your software is probably still set up to work with the old one. I'm not actually sure what the problem would be, and if I give the wrong advice, maybe someone will come along and correct me. Most of the network cards I've used have come with software, and will set up your TCP/IP to work with them. It should override the previous software. TCP/IP (I think) has to be bound to the hardware.
The software you should have gotten might require you to quit the add hardware wizard. If you used the software and followed the directions, open Internet Explorer, go to Tools -> Internet Options -> Connections and click the LAN Settings button, check that "Automatically Detect Settings" is checked.
There is a virus or two that might cause your problem . . .
You might check the D-Link support site
for installation help - I would link you to direct help for your card, but they want the exact modelname and I don't know it.