UrgeMS.exe seems to be causing issues for a lot of people. I mentioned previously that you can disable the process via security policy, and someone pointed out a registry setting to disable it a little cleaner.
I was hoping they'd fix this in the future, but it looks like all they did was make it worse. A recent update made this process a bit, shall we say, heartier. In previous versions, UrgeMS.exe was launched only when Windows Media Player started up; now it seems to launch the process repeatedly while using URGE. Worse yet, the registry fix mentioned no longer works - whatever launches this process explicitly resets the Enabled registry key to true.
A user on the CNET forums posted another workaround: replacing the UrgeMS.exe process with an "empty" executable. So while Windows Media Player will still repeatedly launch this process, at least now it won't thrash your disk and use a significant amount of CPU.
I've attached the empty executable I'm using - it's simply a new console application generated in Vista. (Compiled with .NET 2.0 - but even if you don't have it installed, it should just exit). Simply save this file to "C:\Program Files\MTV Networks\URGE". (If you've previously blocked this by policy as mentioned in the previous post, you'll have to remove that policy as well).
That said, I'm getting pretty fed up with having to do these workarounds. I do hope MTV and Microsoft address this piece of software soon, or I'm going to have to look elsewhere for my music subscription.