Hi all, I've scoured the internet in search of a solution to this. I'm sure the solution to this must be pretty simple. When I open disk defragmenter it doesn't list my C drive -- which is the primary internal HD on which the OS, windows 7 64 bit, is installed. I have another partition that came with my computer (Dell Studio XPS) on which Dell has some a backup recovery image on, and this drive 'Recovery (D' _does_ show up. Just the 'OS (C' drive does not -- which happens to be the drive I'd like to defrag. I haven't tried any other defrag programs yet. I'm the administrator user on this computer if that's relevent. Also, if I go to properties on my C drive via my computer and click defrag from there, it'll open disk defragmenter and still just list the D drive. Any suggestions?