Dear wajahat,
You will see in the attachement a virus which will do the following thing If you just double-click on it (I compressed it with password AzSxDc123 by PowerZip program ):
-pop-up masseges
-task-manager and run command will disappear
-right-click will not work.
-you will not be the administrator of your PC, in othe word you will not be able to change any of your regisry setting or access regedit.
I don't know in which language this virus was written but I'm sure it's not in ms-dos.
Kaspersky anti-virus is the only one could capture this virus ( symmantic, mcafee, Node32, Punda and Trendmicro will not capture it, I tested them).
After eliminated the virus files by Kaspersky you will need to repair the registry entry by using Hijackthis program and fix only line 06 and 07 ( plicies system ) and then you can enter regedit and restore run command and task manager.
Best Regards,