NIS 2009 won't open

Hi

 

I need some help

 

When I turned my PC on today I tried to run a system scan. When I tried to open NIS09 from the system tray I was only able to see a small grey window. When I try to double click the icon or try to open it from the start menu I get a larger grey window in the middle of the desktop.

 

Everything has been working fine up until this happened this afternoon

 

I am using Vista Ultimate x64

 

Any help would be great

 

Thanks

 

Iain