I had XP SP3 until Christmas. Then I bought W 7. I wanted to use the Media Centre so bought Ultinate, but Home Premium woulld do it. I did run dual boot XP and W7 for a few weeks but soon ditched XP. Imade a copy and an image of my data - my HD was partioned C for Programmes, and F: for data, on to an external HD (basically "My Documents" ) then I also saved my e Mail folders by exporting them. THen I formatted the main HD , doing a clean install of W7 (still with 2 Partitions) Then reinstalled software - bought ATI 2010 and Roxio 2010. You will need to decide what e Mail system, as W7 does not have Outlook Express. I used Outlook 2007. Then downloaded drivers for hardware, then copied "My Documents" to F: partition, and imported e Mail stuff and, "Favourites etc. With hindsight I would not have bothered with the dual boot phase. I thik there are other methods where windows will keep old stuff, but I can only say what I did.MS update advisor will tell you if your hard and software is OK. Allow a day!!