avast! Staff: File and Folder Permissions for avast! ?

In an attempt to tighten the security on my laptop running XP Pro I stubled upon the security settings required for avast! installation folders.

  • What - exactly - are the security settings applied to avast! installation folders during avast! setup?

  • What are the most restrictive settings possible so that restricted users still can update the virus database and the avast! program (either automatic or manual)?

I would appreciate as detailed information as possible.

Thank you.