You cannot just change the extension, that wont work. You need a PDF converter, i havnt found any freeware though

http://www.thebeatlesforever.com/processtext/abcpdf.html

1)
Usually to access the BIOS (http://www.webopedia.com/TERM/B/BIOS.html) you have to press a key or a combination, this usually could be the DEL, F1, F2 keys. When you boot up your pc, on the very...