hello, i have recently installed win7 (which is AWESOME!!!) on J:\ and have my earlier VISTA (which is crap installed on C:\ as shown below. HDD1 - 1TB C:\ - 200gig has VISTA D:\ - 800gig has just files HDD2 - 1TB J:\ - 200gig has win7 H:\ - 800gig has just files note that each installation is on a separate PHYSICAL hdd!!! my machine is DUAL BOOT (meaning i can choose which OS to boot at startup) and i DO NOT have a cd-drive. so now i am running win7 and am trying to rid myself of the VISTA install but when i tried to format C:\ (in computer management), the 'format' option was not available or rather windows (7) would not let me format. i was also UNABLE to format c:\ drive in 'my computer' my guess is that there are some files that are being shared between the 2 OS's but i'm not 100% sure. i also read that the boot.ini or bootsqm.dat might have specific boot information that if formatted, would render my PC non-bootable. is that true? and if so, how can one avoid this problem? and, if i do somehow manage to format C:\ drive (VISTA), will my windows drive (which is drive J:\) have an impact on my PC since its J: and not C:??? i can't be the only one in this situation since sooooo many have tried win7 the last few months. 1 - how can i best go about removing that partition and/or formating that partition???? 2 - is there anything i need to do before removing the older VISTA installation? are there any shared files that maybe the new win7 install would use? i'm referring to documents and settings folders and such. hope that wasn't too confusing, thanks for reading it all and thanks for any input!!!