Hello! Back with Avast again after lengthy testing of another product offered by my ISP. Avast is far superior and I will never stray again!

I'm running XP Home, SP2, all critical updates. I downloaded Avast 4.6.603 Home Edition this morning, VPS 0508-3. The Windows Security Center correctly identifies the VPS, but, says I'm running Avast 4.5.603.
Anything to be concerned about?
Glad to be back...
Dave