computer infected -- super slow internet connection

Hello All,

I'm new here and desperately in need of help. I'm no expert, but usually can figure out my own problems up until now.
I was tricked into clicking on a facebook link, and since then, my internet connection has been extremely slow.

I am running windows XP pro, SP3, with firefox 3.0.3, zone alarm free version.
All windows security patches for windows XP are currently up to date.

I have followed all the guidelines here and have tried everything I can do before posting.
I am using bitdefender antivirus, and definitions were updated -- scan showed no problems.
I have cleaned out everything using ccleaner, my drives are all defragmented, and have tried Malwarebytes' Anti-Malware 1.30, spybot search & destroy, spyeraser, and scanned with mcaffe stinger with no luck--nothing found.

superantispyware did find a few things listed below, but now scans as clean, even though the problem still exists.

Unclassified.Unknown Origin/System
C:\SYSTEM VOLUME INFORMATION\_RESTORE{9CD5FEA2-0030-4966-A205-AA651F5168F1}\RP827\A0265565.EXE
C:\SYSTEM VOLUME INFORMATION\_RESTORE{9CD5FEA2-0030-4966-A205-AA651F5168F1}\RP827\A0265566.EXE
C:\SYSTEM VOLUME INFORMATION\_RESTORE{9CD5FEA2-0030-4966-A205-AA651F5168F1}\RP827\A0265567.EXE
C:\SYSTEM VOLUME INFORMATION\_RESTORE{9CD5FEA2-0030-4966-A205-AA651F5168F1}\RP827\A0265568.EXE
C:\WINDOWS\SYSTEM32\REINSTALLBACKUPS\0020\DRIVERFILES\SW20.EXE
C:\WINDOWS\SYSTEM32\REINSTALLBACKUPS\0020\DRIVERFILES\SW24.EXE
C:\WINDOWS\SYSTEM32\SW20.EXE
C:\WINDOWS\SYSTEM32\SW24.EXE

Thanks very much in advance-- any help is greatly appreciated.