This one worked nicely on my PB 590 Hillary MB Bios upgrading it to the 1.00.07 BY0R version.
I suggest you make SURE your MBoard is one of the listed here and print out yourself the part of "PB Upgrades" that says about bios upgrade procedure and then simply follow it step by step. The "exe" file will format and prepare for you a boot floppy. After you upgrade and reboot you will need to click F1 to enter your BIOS SETUP and restore the boot sequence FLOPPY, HD, CD. If there is ANYTHING you do not understand about the procedure I recommend call your cousin and ask her for help.