No, BIOS passwords can be easily reset. Read on LabMice.net on how BIOS passwords are reset, or more easily are bypassed on some models by simply holding the left shift key during boot!!!

Also a BIOS password does not offer any protection from placing your notebook hard disc in another computer. In another computer as secondary disc, the security settings of the operating system booted from apply, so any Windows security on your notebook hard disc is easily bypassed.