Hi guys, I have just hit the same problem. I am running XP Pro on this m/c and have a 3-user AVG licence (v9.0.725) - updated today (2/Jan/2010). Have tried the usual steps (inc. deleting temp files, check system date, etc) followed by AVG update - no updates detected. The only thing that might have affected this is my CMOS battery died 31st December and I changed it yesterday. The default date of Aug 2001 may have been temporarily used when online 31/12 and 1/1! My HP laptop with Vista 64-bit is running the same version and all is okay.
Any ideas, please? regard john.