Another suggestion, if you also have firefox try it on that to see if you stll have the same problem.
Does the slowness settle down after a while, when you start the computer up
(ie..it goes ok after a few minites...or is it constant all the time...
Anyway here's a download to malwarebytes
http://www.malwarebytes.org/
And here's a quick install and set-up guide
The important thing here is .. make sure you have "update MalwareBytes" checked before it finishes setup, it usually is by default
Here is a brief install and use guide
http://www.downloadbe...n-of-your-pc--33.html