Found this on a HP forum. Works on my pro2 and saves me a hard reset!
I had the same problem after Installing TOMTOM 7. Everything was working ok when I was working on TOMTOM 6. After installing tomtom 7 and reset I start getting the BTTrayCE.exe failed because of memory. Not only that but I also lost the sound. I mean all the sound, cannot play MP3 ringtone don't work, and MS voice also fail to start.
I spend to days and googled a lot until I found the problem and fixed it. Here you go:
TOMTOM places a new BT dlls under the windows folder that I had to remove:
You can either ename them or remove them and then soft restart your IPAQ and everything will go back to normal.