Software in Windows blank dropdowns

On my computer the dropdown boxes for File, eidt, etc are blank! If I go to tools and to the bottom of the blank box, suddenly everything appears but disappears when I go back. It's working fine on my colleagues machine in the next room (downloaded at about the same time) but not on mine! Any ideas?

Whats the OS? How did you unzip?

I had trouble in the past when the file was unzipped using the inbuilt utility on Vista machines.

OS is Window XP. I tried twice using built in unzip. but I still get the same result.
I was hoping someone had had the same problem and could give me an easy answer. I think I might need to re load my windows which is a really big problem.

Does any of this help...

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1256691945