[luke27]

i have been trying to fix my brothers laptop tonight, the original problem was that they were running a 32 bit OS and that they had downloaded LOADS of crap they never used and messed with a lot of settings. i planned on restoring it to factory settings and then installing a brand new OS from my HDD, windows 7 ultimate, using the trail period for 30 days untill i can buy another license (unless i can use my current laptop license can i? im not sure :/) anyways, i couldnt factory restore so i jsut installed the OS and then planned on removing everything from the computer after id done this since the computer would barely work beforehand. so i installed windows 7 and then set about deleting all the old windows files, i couldnt delete a few because i apparently need the "trusted installers permission". then the system had to restart and then on booting up i get the message bootmgr is compressed, press ctrl alt del to restrart.

how can i completely wipe the HDD and then boot the system again from my external HDD (the one i installed windows off the first time)?