Not an expert, but I recently installed W7 64bit - previously on XP- on a smaller HD. I partitioned my HD - total 320 gig into 50 gig for system, balance for data (I had C; for programmes and F: for data before)W7 has an "index" system that gathers info as to where files are, so I would suggest you copy the E: data to an external HD, then copy it in to the data partition of W7 - then "tell" W7 where to find music etc. I would install programmes first . I use pipex (tiscali) - W7 does not support Outlook express so had to get help to switch to Outlook 2007 - but you can get Windows mail. Do look up via Google how to transfer settings for e mail etc.