My Computer Freeze-d!

I was having some freezing problems with my computer for these last few days. Didn't know what caused it at first. It was so bad that I was having trouble connecting online. It was pretty scary. It was by chance that the computer was able to go online again but still froze for a couple of times. When I wanted to do disk cleanup, it was then I discovered that I unknowingly downloaded ActiveX. I guess it was when I browsed a site with ActiveX or something like that that my computer automatically downloaded the program. I don't know why it caused so much problems. But, I have uninstalled it and now the computer seems OK. Phew!