Same thing here. ATT told me you can't uninstall HTC Sense because it's part of the operating system.
Frankly, I am sick of this phone doing abnormal resets. ATT tech said installing GO Launcher EX would stop that from happening. It does for a while, then it starts again and I have to make GO default again.
This is a software problem. I have called ATT & HTC. Sent the phone to HTC TWICE and I'm still having the problem.
Last time I was in ATT, TWO other people were in there with same problem. One lady had her phone replaced and the replacement was doing it. I can get a replacement (refurbished), but what's the point?