You need to look at what was added to your computer. Remove add ons that you may have accidentally gotten on your computer. There are ways that you can find out if you have unwanted spyware on your computer.
NEVER SAVE YOUR PASSWORDS ON THE COMPUTER. CHANGE YOUR PASSWORDS OFTEN. DON’T USE THE SAME PASSWORDS FOR VARIOUS SITES.
Other signs include:
-unwanted pop up ads
-a hijaked browser that takes you elsewhere
-your Internet home page has been changed
-your tool bars have been changed
-icons that you didn’t put on your computer
-keys that don’t work such as your such as the tab key
-slow performance of your computer
-random errors from your computer
This information comes from a FTC Consumer Alert from July 2005. Check with the Federal Trade Commission Bureau of Consumer Protection, and Office of consumer and Business Education for more up to date alerts.
I know that my neighbhor who owns Jaws in Two Harbors, A Computer Repair Store can identify the problems with a computer easily. He has has the tools to find out what is going on and comes to our house off and on.