LSI - Tech Links
Utilities:

Major Geeks
Antivirus / Anti Spyware:

Spybot - Free Spyware Remover

System Spyware and Parasites explained
XP Troubleshooting:

XP Recovery Console Instructions

LSASS.EXE THREAD

Sysu.exe XP Taskbar disapears
Link 2

Registry Tweaks for XP