We have a Dell T3400 computer with Windows 7 (8GB ram) and an ATI HD5500 video card in it. We have found as long as we dont open GroupWise Client HP1 the computer runs fine. As soon as we open Groupwise client, the client appears to hang and applications open will turn to black or transparent and you can only see the edges of them. I have tried uninstalling and reinstalling GroupWise Client with Cleanit as well as changed out the video card drivers.

Any ideas what could cause this?