If by master password you mean the BIOS password, we can not provide help with that on this forum, it is against the forum's rules to aid in cracking passwords because we can not verify ownership of the system. Your best bet is to contact the vendor/manufacturer and be prepared to show them proof of ownership.
[Got an acer 5335 vista boyfriend set master password on it now can't remember it how do I get into it? Oh I'm mad!!!!!@
try to remember the password. ask the boyfriend. make sure you get the precise password as it is case-sensitive.
next time, store it in a secure but easily reachable place.
try contacting acer customer support with proof of ownership.
try using a password recovery disk if you have one.
try this link: http://www.tomshardware.com/forum/64241-35-locked-lapto...
can't discuss anything about password removal/bypassing/cracking. these are not allowed on tom's hardware. besides, no matter what you say, there is no way to verify you as the legit owner. read tomshardware's rules here: http://www.tomshardware.com/forum/57950-35-read-first