I tried to setup a dual-boot system on our home pc. unfortunately, the cd was corrupted and the installation failed. i then rebooted the system to make sure it was ok. It wasn't. "PBR error" or something like that. so i natually assumed the bootloader was corrupted so i used a windows installer disk to try and fix it. however it asked me for the admin password (which is blank). i entered the correct (blank) password and it said the password was

INVALID?!?! anyway , i went with a =reparatory install. i tried the ubuntu installer again and discovered that the window's partition's bootable flag was off. i fixed that and rebooted. But windows STILL wanted to go through with the install. there was no choice and i had to do it. in the end, no data was lost.
feel free to laugh at me if you like.