The error logs are verbose to help Alwil, they aren't particularly user friendly to a user, more for technical support. I don't look in my error logs unless I'm experiencing a problem and generally that isn't an issue. This has just prompted me to look, I only have 1 entry in my error log and that is from 29/12/2005 and I can't remember that presenting any problem.
Other than the error log info are you experiencing any problems ?
If not I wouldn't scare myself by looking at the error logs. There can be occasional glitches with an update that throw up these verbose logs that aren't a permanent problem. Are you able to update now, is you VPS the latest 0607-1 ?
You could try a repair of avast. Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Repair, click next and follow. You need to be on-line to do this.