ccleaner http://www.ccleaner.com/ avg7 for windows http://www.grisoft.com/doc/71/lng/us/tpl/tpl01 cwshredder http://www.intermute.com/products/cwshredder.html ad-aware se http://www.download.com/Ad-Aware-SE-Personal-Edition/3000-8022_4-10319876.html?tag=lst-0-1 spybot s&d http://www.majorgeeks.com/download2471.html download, update & run in safemode in this order online virus scan http://housecall.trendmicro.com/housecall/start_corp.asp
Just to add to ddp list http://www.trojanhunter.com/ its not free but you get 30 days of it and it does allow you to update it during the 30 days. Also if it's not spyware try and defrag the hdd.