I've been using this site for years when I need computer help. Their specialty, in my opinion, is in computer security. If your computer is littered with spyware, malware, or viruses, a simple search could save you hundreds of dollars by resolving the issue yourself rather than having a computer technician fix your computer.
The community on bleepingcomputer is very friendly and knowledgeable, but please be patient as they have lives also and will get to your post in 2 or 3 days, if not sooner.
They forum is also a great resource for computer and software tips.