copy paste problem

Whenever I copy and paste the word "hello!" comes up.:cry
What should I do? I already did reboot my PC and unplugged and replugged both the keyboard and mouse and still it happens. I used both the method of ctrl+c and ctrl+v and the still the word "hello!" comes up. Even if I right click and copy and right click paste..still the word "hello!" comes up.
Please help me.
Thanks..

 

Sounds like some kind of virus to me. Work your way through this thread http://forums.majorgeeks.com/showthread.php?t=35407 and if you are still having problems after, make a post in the Malware Forum as directed in the thread with attachements.

 

if anyone knows how to do this please tell me. It sound like a great prank. But yes i think it is malware or one of your friends messing you about.