That's a relief to read.
At least that came up clean. Email me your HIJACKTHIS LOG (a link how to later.) But you didn't tell me why you would not suspect a failing HDD or an overheating computer.
Here's how to make a log -> http://www.bleepingcomputer.com/tutorials/how-to-post-a-hijackthis-log/
Remember I'm only going to check for things I know about. Overlapping security, toxic combinations that I know about. Again, the fact it had a virus means the OS can be damaged and the good news is you can get your files out and reload the machine. Some folk think that all OS damage can be fixed. True, but at what cost?