toshiba laptop win home prem. 7 x64 :this was an operator error.my young son came to vist/school break from univ. .He changed user account access to:NO ONE. Now he's safely back and,i have a partial running p.c..C an not access audio/video files;can't save programs from online to trouble shhot;cant access the standalone seagate backup usb drive;can;t start sys. restore pop up demands Admin. Permission-- as does efforts to copy to from cd/dvd drive all return :you do not have permission.have backup files on the standalone Seagate 1.5 t purchased just for backup purposes------ I know! when in doubt ---back it up twice.can i install a new purchase of win 7,and "install past this problem"?Data will be lost but "much will be learned".Any help greatly apreciated. thanks, john