I saw this a couple of times in the past, but when I right clicked on the "M" it came up and did say both versions were installed but the version info on the files was for 8.7i. What my issue ended up being was a registry entry in HKLM\Software\Network Associates that didn't get removed when that computer was upgraded to 8.7. It wasnt really running both versions, but it was reporting because as such because it had keys in there referencing both versions. I dont know if that is actually the problem in your particular case, but might be something to look at. It was a while ago, so I dont remember the "exact" key to point you to.