Everytime I boot up the computer, after 5 minutes or so, my computer would slow down.

I had no idea why.

I checked the task manager and found a program that kept increasing in size.
svchost.exe.

So I ran AVG. Free anti virus program.

It found 16 viruses on my computer.

I was shocked.

Did it help?

*Checks task manager*

*Task manager won't open*

OMG.

After 1.5 years I have to reformat the computer..

Sigh.