Scan your computer on http://housecall.trendmicro.com/ - Trend Micro
http://www.ravantivirus.com/scan/ - RAV
http://www.pandasoftware.com/activescan/ - Panda
scan your computer for spyware here http://www.doxdesk.com/parasite/ or http://www.pestscan.com/
Run http://www.safer-networking.org/en/mirrors/index.html spybot

run a browser which spyware cannot hijack that easily http://www.mozilla.org/products/firefox/

tune oup tips
http://www.fixyourwindows.com/windowsxpsolutions.htm
http://www.blackviper.com/WinXP/servicecfg.htm