I have to agree with willcomp. Check your system for spyware and viruses using Ad-aware or SpyBot. Here's how:
Scanning with Ad-aware SE:
- Open AdAware SE
- First of all, check for updates.
To do this, click on 'Check for updates now', click the 'Connect'-button and, if there are new updates, click 'OK' and then 'Finish'.
- Now, do a system-scan by clicking the 'Start'-button.
- In the next screen, select 'Perform Full System scan' and click the 'Next'-button.
- Sit back and relax, while Adaware is performing the system-scan.
- When the scan is done, right-click in the list of items, that AdAware found, and select 'Select All', click the 'Next'-button and then 'the 'Finish'-button.
- Close AdAware SE.
Scanning with Spybot 1.3:
- Open Spybot 1.3
- First, Check for updates
click the 'Search for updates'-button. If there are updates available, select them and click the 'Download updates'-button.
- Click 'Search and destroy' and then 'Check for problems'.
- Relax, while Spybot is performing it's scan.
- When Spybot is done, it will show a list of found items (or congratulate you with a clean computer). Click 'Fix selected problems' to delete the items.
- Close Spybot 1.3
Download and install the following programs, If they're not on your computer, yet:
-AdAware SE: http://www.lavasoftusa.com/support/download/
-Spybot 1.3: http://www.safer-networking.org/en/mirrors/index.html