You need to give us more information. If you to reinstall the operating system on your computer, then its best to boot the computer off of the WINXP CD. There you will be given the choice of where you would like to install the OS. I would recommend deleting the partition and then create a new partition and format it. If on the other hand your HD has more than one logical partition and you just want to format the c: drive that may be more complicated because your boot sector is probably located in the c drive. Therefore you can not reformat it without knocking out your whole OS. Rick Torres PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml