Hi Drummer and welcome aboard.
I doubt that its a virus,there is a "joke" program being sent around that can do it but as far as I know it just does it the one time.
Do a file search for cupholder.exe and delete it if you can find it.
There is also a version that is a VB script that runs when you click on this link :
http://www.modelscams.com/cupholder.htmlMaybe a search just for cupholder would do to find whichever is the offending program.
Good luck and let us know how you go on