I did a virus scan this morning to get rid of a virus that had popped up on my computer. Upon completing the scan I restarted my computer and now I cannot use executable files. For example, I try to start fire fox by double clicking on the short cut on my desktop, the icon in my start menu or the icon in it's program file and it comes up with prompt asking me what application I want to open it with. Other programs such as iTunes come up with an "application not found error".
Is this a result of something Norton did?
Any help in solving this problem would be greatly appreciated.