I'm not sure I've actually posted something about it before, but I've been experiencing a lot of problems with my computer over the past week. It has slowed down considerably, often has programs not responding and things like that. I was already thinking that one of the 40 gig disks in the raid array was gonna go belly up soon, but today I learned that it actually has something to do with Q811493.
Q811493 is a windows XP (both 32-bit and 64-bit version) hotfix, released on april 16th 2003, updated on april 17th. Technet Bulletin MS03-013 has details about the hotfix.
Since another site mentioned it being a combination of the hotfix and virusscanners (such as EZ Anti-virus Realtime , MacAfee version 7 and Sophos AV) I contacted Sophos support to verify the information presented.
Within minutes (if not seconds) I received the following mail :
Yes there is an issue between Sophos and Microsoft's hotfix Q811493 and
development is aware of it. At the moment the only workaround is to either
uninstall the hotfix, or uninstall the software- quite a dilemna. We will
keep you informed as to what the next steps are going to be.
Sophos Support (actual name removed)
Is that good and fast support or what? At least now I can confirm that there is indeed a problem with *extreme* (no kidding here!!) slowdowns on XP machines after applying Q811493, in combination with certain anti-virus products.
Since I always go for security, I'll just wait till either Microsoft, or Sophos comes up with a patch or workaround for this problem. In the mean time, both the virusscanner and the Q811493 patch remain installed.