OK thanks denmo83 and Bruce A Thompson ... Did that and the results are in the picture below... I guess 17453 is not too shabby for my home built 2 year old machine.
I also downloaded and ran the free PC Matic scan tool - it found few issues apart from my slow internet connection. I was aware of that already (DSL) but the way I use the internet, I don't feel the need for [more] speed..
My two video cards are model GeForce GTX 520, plus I use 4 USB video adaptors to run 8 monitors... but perhaps the 645 ID'ed above refers to something else...