I downloaded Comodo Memory Firewall 18.104.22.168 yesterday and installed it on my Windows XPSP2 (fully patched) without incident. The machine is a Dell Dimension 4400 (P4, 1.7 GHz) with 512 MB RAM and 40GB HD; old enough not to have DEP. I am using CFP 22.214.171.1246, BOClean 4.25 [both with no issues at all], AVG Free, and some demand spyware scanners which were not active during my tests.
Unfortunately, this morning I found a direct conflict between CMF and Microsoft’s DropMyRights procedure, which I use to run my e-mail utilities with reduced (that is, ordinary user) rights.
What I find is this: when CMF is installed, DropMyRights starts and launches the required application (in my case this is the e-mail monitor PopTray), but then consumes essentially all of the CPU resources (about 96%) forever, instead of turning control over to PopTray and exiting. This occurs when “Restricted PopTray” (that is, DropMyRights running PopTray) starts with Windows or when I start it manually. Killing DropMyRights manually from ProcessExplorer puts things back where they should have been without manual intervention.
This conflict is serious enough that I have uninstalled CMF and will not install it again until the conflict is removed.