problem with gpu driver for cuda 2.3 and dotNet

after installing the gpu driver for cuda 2.3 I have noted that my application (dot net VS2008 or VS2005) is hanging up when I tried to start it.

What is going on? how can I solve this problem.

on my development machine everything is fine, but I noted the first days some kind of hanging up that was solved by pressing ctrl+Alt+delete.