I have winserv2k3 installed with file server, AD, DNS, and Exchange on a single machine. It works fine untill I try to install an antivirus program on the server. I have tried a couple (currently trying GFI) and every time I get startup errors. In the event log I get 7000 and 7009 under "System" Service control manager (microsoft information store failed to start) and (timout 300000 milliseconds) and I get an 8197 under application with an (error installing virtual machine). Anyone know how to fix this? Also, my exchange server does not function after startup.