WE have recently removed f-secure from the exchange server and domain controller. (windows 2008 DC and Exchange 2007). I then installed AVG professional. This caused many problems with the Domain controller after bootup - the problems consisted of a grey screen with a mouse cursor, the domain controller would not boot and would stay in this state. I then discovered that Registry kets are left in via F-secure, After some research I found the keys and removed them. This has solved the Domain controller issue. However the Exchange server still tends to have this issue but less frequently (about 2-3 days). the only cure is reboot, which is not acceptable. Does anyone know which additonal keys are left when the exchange snap-ins for f-secure are removed? or what else could be causing this issue?