If you have Microsoft Security Essentials already installed, and attempt to upgrade your AVG 8 to AVG 9, you will receive a prompt that Microsoft Security Essentials is not compatible with AVG. It gives you the option to cancel the installation and uninstall Security Essentials or ignore the compatibility issue (not recommended of course) and continue with the installation any way.
For those of us that like to have a multi-layered protection, I have discovered that the installation will fail if you choose to continue after receiving warning. But all is not as bad is it may seem at first, after my initial failure, I simply opened Task Manager and ended the process 'msseces.exe' that runs the real-time protection of the Microsoft Security Essentials, and restarted the AVG installation. A restart of computer will restarts the msseces.exe process, and both programs seem to play well together after that. Scans from both applications completed successfully, and neither one triggered any false positives or warnings from the other.
On another note; The previous technique was performed on a laptop with XP Pro, while the next suggestion worked on another laptop with XP Home installed.
Since I did not have Microsoft Security Essentials already installed on the XP Home system, I simply upgraded my AVG to version 9 first, and Security Essentials had no compatibility issues whatsoever with installing.
Just thought some of you out there might like to know!
You should never have multiple antivirus programs installed since they will conflict with each other. See this post for more information as well as uninstall/cleanup util links Before Installing AVG 8.5 Free Edition
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AVG Free Forum member since - Nov. 12, 2004
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Plan A is always more effective when the device you are working on
understands that Plan B involves either a large hammer or screwdriver....
I had a tech uninstall AVG 9.0 Free, and install microsoft security essentials, but he was not able to get the avg free to reinstall, as he could not get the microsoft security essentials working properly. Now I get a host of error messages when I open outlook, and when I open an email or calender. He tried uninstalling Microsoft Security Essentials and re-installing AVG Free, but now AVG won't allow the install unless I uninstall the Microsoft Security, which I did. Apparently there are some hidden files left on my computer that my uninstaller cannot see and remove, so each time I try and re-install aVG, then I get an error.