I have a HP Pavillion A6325.uk - I think it needs a new hard disk - Whilst I was doing this I was going to upgrade the OS to win 7. I check on the HP site are there are no win 7 drivers listed. Does this mean it will not work ? - or all the drivers will be on the win 7 disk ? Would I best getting the 32 bit or 64 bit version of win 7 ?