First, Whenever posting questions on these forums, please give us as much information as possible about your computer. Depending on your issue, we might need the operating system, processor speed, amount of RAM installed, brand name of the computer, (if there is one), and any EXACT error messages you are receiving. The more information you give us, the better informed our answer will be.

In the meantime, try the procedures in the links below.

First, since this could be spyware related, please download, install, update then run ALL of the free spyware removal tools from the links below:

Ad-Aware