I have replaced a couple of ten-year-old PCs with Windows XP and Office 2003 on them, with new PCs with Windows 7. I had no problem installing Office 2003 on the new Windows 7 PCs and getting it activated with the Office 2003 license keys from the old PCs (the old XP PCs with Office 2003 on them had failed and were thrown out). Even if you wipe your drive and do a clean install of Windows 7, you should have no problem installing 2003 and activating it, assuming of course that you have the Office 2003 install disks.