well, my computer doesnt boot past the windows xp home login. I also cannot run any tasks. This started when I changed a setting in administrative tools, under ssdp discovery service settings. The only access I get is to safe mode command prompt. I tried windows repair three times and that didnt work. So now i just want to scan the drive and see if theres anything wrong with the registry and original boot files. I tried fixing the sam, security, system, default and software files but i get access denied. I'll try any other ideas but i am not formatting the drive, because I need many of the files. Thanks for any tips, and your replies.