Here is a little history. This is an old laptop that was my son's in high school. When I started, it did not have anti-virus or spy-ware detection. I deleted a lot of junk, and attempted to download AVG. It did not have enough resources, so I downloaded Avast. Avast found 261 viruses. I then downloaded Ad-Aware, but it would hang due to low resources. I tried CCleaner and it found a few items. Since my last post, I have attempted Ad-Aware again, but it still hung. Then tried AVG spy-ware. It found Backdoor.Afcore in the system files. I deleted it and ran again in safe mode with a clean scan. Avast also gives a clean scan. However, when booting now, I get a RUNDLL, Error loading C:\WINDOWS\system32:ufjcxsh.dll. The specified module could not be found. There is a click OK box, then boot continues. It still boots very slow, and I do acknowledge that it is very old, low on resources, and Avast slows it down. Should I try SpyBot in safe mode? Thank you for your interest and help.