The version of PSI shouldn't matter, as all versions use the same database. Benny G is using PSI 2 according to his signature.
Gears.dll is/was a part of Google Gears, which is no longer offered. On my WinXP machine, there has never been a version of Google Chrome nor Google Gears installed. On my Win7 machine, Google Chrome was installed when I bought it, but was never used and promptly removed on the day this laptop was delivered.
I've figured out why PSI isn't listing gears.dll as out of date. It's because gears.dll does not exist on either of my machines. I set Explorer to show all hidden files and folders, and then did a complete search of the hard drive. I don't know why it is installed in your Avast SafeZone folder at all. I am running AIS 8.0.1483.