Arduino.exe freezes on uploading, not Logitech

Whenever I try and upload a sketch to my board, the program freezes, and if I try and move the program, minimize it, close it manually, it freezes my entire computer. I've uploaded teh basic, blink program before, and I've checked for the Logitech program, and there's nothing like that running. Please help.

What machine and OS are you using?