Has anyone ever come across a laptop that will only install the original OS,being Vista Home.Recently I was checking a Acer 6530 Aspire LTop and the owner wanted to downgrade to XP as Vista was corrupted. I removed the HDD and checked with USB on desktop to salvage music files and there was about 10 FOUND folders meaning the hard drive had some sort of sector problems.I refitted the hard drive & proceeded to install XP - after loading setup files - no disk found appeared.I rebooted to check bios to change hdd setting to IDE, happened to check security & it had "Hard Drive Password Frozen".Replaced with new HDD - same thing. Installed Vista on new HDD no problems - checked Bios setting & Hard drive password CLEAR.Used first hard drive on another laptop(Toshiba) - Installed XP OK.Even updated bios but the lappy will not install XP OS only Vista. Any Ideas? as a google search (found this model had been downgraded ) but no info on this weird problem.