Llnstoppable Hi.
It sounds to me you have downloaded something nasty, (a worm)
Check your system using any of these programs (I reckon using all of them):
Start with the AVG Free anti virus, That has a fix for your virus/worm & its better than most paid for ones.
(Click on this blue link) Download & Update program before scanning
AVG Free Advisor: Installation files & documentation
You can Uninstall it after use if you wish.
When you suspect virus/Trojan/worm activity, It is my recommendation that you reboot in Safe Mode
As some threats are embedded & will load at startup, making them hard to remove when running in default mode.
These Other programs are all recommended by us
http://www.ewido.com(>>now called AVG Anti Spy ware<< free 30 day trial -the best in my opinion)
Select Your Product - Home - Lavasoft)
http://www.ccleaner.com/download/(free)
Spybot - Search & Destroy (FREE)
You can also read here point 4 in the post of LOTR....:
http://www.gnutellaforums.com/showthread.php?t=41432
Shout if you need help & feed back helps others.