Today I installed Windows 7 ultimate on my computer. After sucessful instalation I started with instalation of applications. Everything worked fine until I installed Windos Live Messenger (latest version). I ran it in Vista compatibility mode to avoid problem with msn in taskbar. But next problem occured: Each time I turn MSN ON my Desktop Window Manager crashes. As reason I get message that one of my programs (msn live in this case) is not compatible with DWM. After that I run Aero theme troubleshooting program, and it fixes problem WHILE msn is still running. And everything works fine till the next time I turn msn on / off. I know that crashing of DWM was known problem on Vista, but I thought it was repaired on Windows 7. Additional informations: I have problems only with PC that I'm using in my office. At home I have same settings and programs and everything works perfect. Tried to contact several people regarding this issue and noone was able to give me sollution or explanation of my problem. Anyone here can help?