MCE is very picky about hardware and more. Get it fixed by the machine's vendor before you get stuck repairing this.
I'm using intervideo 7 platinum and have upgraded video card to GeForce FX5700LE 256 mb. and have downloaded latest driver. My problem is the tv signal will stay clear from 5 to 20 seconds then goes all blocky and if I do not exit will eventualy freeze completely forceing a power shut down to recover.