Need help partitioning & formatting a second SATA hdd

Hello! I have installed the sata drive from my wife's computer into
mine. I would like to use it for backups and some media storage, but I
wanted to ensure it was spotless and in good working order first.

Her computer had a serious glitch, meaning we couldn't get it to boot
into XP, the recovery disk from Gateway said that it found an active
recovery partition and would start from that, then it would lock up
after it copied only a few files. In short, she has a new win-7 compy
now.

After installing the drive in my computer, it appears normal in My
Computer, and I have Admin rights, but when I try to format, it says I
don't have permission.

I read the help online at MS Win XP support site about using Fdisk and
Format, but apparently I do not have Fdisk, since the command is
unrecognized.

Should I simply download Fdisk from somewhere and use the command line
to run it on my new "G:" drive?

I'm not sure what specs are needed to help with this problem, please let
me know if this is not enough:

Gateway model GT5012, Pentium D 820, 4 gigs DDR2 ram, and now two 250 GB
SATA, each 7200 rpm w/ 8 MB cache. Western Digital brand, I think.
I'm running MS Windows XP Media Center Edition 2005, with XP sp3 and all
updates installed automatically.

TIA!
--
Tin Lizzie
"Elephant: A mouse built to government specifications."-Lazarus Long