Unhealthy state error ICAS

The Cognos Express Manager reports an error: “A part of this product is in an unhealthy state: ICAS”.

Everything worked OK for a while, but recently after the restart of the server (Windows) this error occured. We are using just Reporter module and almost everthing seems to work correctly except the backing up.

After the error occured I tried to install Xcelerator module and the installation failed. In the express.log i found: “An error has occurred during the action: Install Xcelerator … SDK-ERR-0082 Modul ICAS service: cxmd failed to start.”

Can someone give me a clue what to do?

Cognos is version 10.1, OS Win 2008 R2.