After 3+ years of file accumulation & XP on my C drive - its time obviously to upgrade BOTH. I have not read anywhere what appears to me to be a very simple approach -> installing W7 onto a new hard drive. My plan is to remove my existing C drive; install a new OEM WD640 HD; boot from W7 disk; format; partition; and then proceed with W7 installation steps. After completion and verifying all is working property, shut down the system; reinstall old C drive back into my system and treat it as a "data" drive. Will W7 have any problems accessing these older files from my old C drive - other than permission issues" ?