1. Scan for spyware. Try this freebie.
2. Take ownership of C:\ Since this is XP HOME? You have to boot safe mode to get to that tab. Read http://forums.cnet.com/5208-6142_102-0.html?forumID=5&threadID=250064&messageID=2500232#2500232
Whenever i double click my c drive in my computer to open it i get a message saying 'Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item'
I am using only one user account which has admin priviledges. If i type C: in the address bar or in run command i dont get this message. Please help.