I have read up on antivirus and looked at some forums from malwarebytes and other sites. My daughters W7 computer is s-l-o-w. My antivirus, avast, thinks all is good. There seems to be a dll.exe program embedding itself within the processes. Learned that this is not a program required with W7 but just not savy enough to remove the whole thing. Read also that even if you do get some sort of antivirus program, some of the viruses already embedded could block itself from being found. Great. So, found out that if you start in safe mode with networking, get a online scanner like eset and then scan for viruses. What I'm wondering, would malwarebytes, if I buy it or free trail version, work without having to start in safe mode? Or will it too be detected and bypass existing viruses? Why I'm asking is that I don't want to have to keep paying for antivirus programs if I can get one to work. Could I use malwarebytes on all my computers, or you pay for just one computer. What I think it is a dll.exe program, I'll end the processes manually, and all is good, but reloads itself within 5 minutes.