Did My Antivirus Cause This?

Aug 6, 2013
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So when I was uninstalling HP Games, it said their was a virus in the unistall program. After I was done, I decided to restart pc. Avast found 3 infections and 1 corrupt. They were all in the Temp folder. The majority was a firefox thing, and the last was a google chrome. So after I got rid of them, windows started up as usual. I couldnt click on the taskbar, but I would like on the windows circle thing, and desktop, just not where the applications would pop up when I opened, and where I would click on the time part, but again I could open the windows circle on the bottom left. I restarted the pc and everything is working completely fine. Everything works completely normal, my cpu and ram is same as normal. What couldve caused this to happen. Was it a virus, or was it an error or something. I also run windows 7. I think it might be because usualy I have to give me pc a few minutes to be ready, but I instantly started installing an update. Another thing to note is that my pc is about 2-3 years old. Could it be age. AGAIN, everything is working fine. I want to know what it is because now im scared todo anything that has anything todo with login into anything.