Software wont load(screenshot of error message)

[abbath]

I have been trying to load up my zune software all night and it just crashes whenever i try to open it. I have restarted, uninstalled with unzoone. reinstalled, restarted and uninstalled again. Every time it gives me the same error message. I am running windows xp. I installed and used the software on my computer fine before. Its the first time its happened tonight.

Heres a screen shot of the error message(the board wont allow me to post links or screenshots so please copy and paste)
i13.photobucket.com/albums/a286/humancircus/zuneerror.jpg

Also i don't know if this will help but when i click the "what data does this error report contain" link thats on the error message i get the following error signature

EventType : clr20r3 P1 : zune.exe P2 : 2.5.447.0 P3 : 4817dd4f
P4 : zuneshell P5 : 2.1.0.0 P6 : 4817dc81 P7 : 34d P8 : 1c
P9 : system.typeloadexception