I have win 7 running ... well, crawling... on a new quad core computer (it really started its slow-down after installing Office 2007). Its so sluggish that I've decided to do a fresh reinstall. Drive C is partitioned and the second partition (F) carries all my data. Its backed up, but I'd like, if possible to format C without interfering with F, reinstalling Win 7 on C. Is that possible? I have the original install disk, and I particularly want to start off from scrathj with a formatted C. How sluggish is my pc? Well, even with just 3 or 4 worksheets opened and no other programs running (except AVG), it takes 5 seconds to switch between worksheets. Saving a 1.7 meg spreadsheet can take over a minute, and just going fil/properties is taking about 15 seconds for the window and data to come up. I'm sick of seeing "not esponding" and the white window while a file is saving or when Ctrl/F6'ing between worksheets. And between you me and the gatepost I'm also tired of being told some features will be lost when saving as an Excel 97-2003 file when those features all CAME from Excel 2000. The only reason I upgraded from Office 2000 was because it just didn't seem comfortable with Win 7 (blurred type and other issues) (and I guess I was tempted to "get with it"). As you may be able to tell, this is also a cry for clues from someone who may have had the same issues and discovered the cause(s). My son has had Win 7 on a laptop for over a year with Office 2003 running and he loves it. Never a moments problem!