WMP - Stop working message - What's wrong?

Hello,
I've just bougth a new HP z 600 workstation for my audio recordings, but i'm hving big issues with my software. Windows media player is not working properly. It is enable to start videos - it crack and i get this message saying WMP stoped working. If i play audio i can listen for some seconds and after a while it cracks too and i get the same message. Because WMP 12 comes with windows 7 i can't install it. so i don't know what to do. I'm having basicaly the same problem with other audio and video programs (quick time, i tunes, etc... ) I don't know what's wrong. Could it be something to do whit the fact that i have a 64 bit system?
Please help

Thanks danny, but no luck.
I did the system scan and WRP didi not find any integrety violations.
I tried to diseble the media features as you said..it seemd to unisntall WMP and later reinstaled again but i still have the same problem.

I have just bougth this machine for my audio recordings, because i have a small home studio. Because i need it to work i have imediatly install the programs i need to work: Protools 9, itunes, quicktime, and i media player classic with the codecs pack (all this programs the 64 bits editions. after i start to work i've noticed that i was having problems with quicktime . it simply don't open. than i tried the other programs with diferent kind of files and is official - something is very wrong. Because Media player classic is a freeware and had all this codecs i decided to unistall it all the codecs pack too - but i still have the same problem - so honestly i can't say if the problem started with this instalation or if it came since the beginning. any sugestions?

I was cheking my restore points and unfortunatly i didn't make a restore point after install protools. I have all the registrations done...is complicated to go back there. I really want to avoid that. i wonder if there is anything else i could do...

I know that hapened with protools 7 and some earlier versions of protools 8, but i use the latest protools 9, and i must say that i have no problems with protools - is working fine. I just cant upload videos to it becaus my quick time is not working and it uses the quik time to open videos...

for what i've red in other forums it must be something to do with video or aaudio codecs...something is corrupted... How can i correct that? Unfortunately i don't have restore points that i can use and i don't want to undo everything...to much work...can someone help me?

Hello... someone's there??