I installed VA trial VA_X_Setup1837.exe on my Lenovo laptop running Vista (32-bit) with Visual Studio 2010 yesterday. It appeared to work fine, very pleased. End of day, exited all apps and shutdown normally.
This morning I powered up and tried to start VS2010. VS2010 is locked up - it only paints the outer frame - not the inner window contents. Not even the VS menu bar appears, so I can't uninstall VA.
Can you try grabbing a mini dump next time this happens, and sending it to us please. This FAQ explains how to do this. Hopefully it will offer some clues about this problem.