Well, I think your only option at this point is to run Knoppix or some live Linux distro (or other Live CD) to recover your data, then wipe and reinstall. Wish I could help you more.

Ack, and if the first thing doesn't work, before repairing Windows using the disk, try this: http://support.microsoft.com/kb/304449/

Oh, and if that doesn't work, use your install disk to repair Windows (not in the recovery console). It'll reinstall Windows and should do the trick.

Hit F8 when booting. Try choosing "Use last known good configuration."

Have you tried removing the new card? That stop error is frequently caused by faulty drivers.

Can you ping other computers on your network? How about if you try http://209.85.165.147/ ? Does it work?

Gmail: http://mail.google.com/support/bin/answer.py?answer=13273

Yahoo wants you to pay to fetch your e-mail via pop, but there is a program out there (here: http://ypopsemail.com/) that will work...