There are secure-shredders that will completely erase files or folders that you select --- but most of the recommended tools for this aren't free. [If any techs out there know a good free tool for this, jump in]. Not having any installation CD will hamper whoever inherits the PC, too - (though you might check if the installation ".cab files" are in C:\Windows\Options\Cabs [there would be quite a few - I don't remember how many at the moment - around fifty?] and if they are there, you could make a backup copy on CD.
If you have CDs for the other programs you'd like to include in the future donation, and you have the full-set Windows .cabs copied onto a CD, you could
1) completely erase the hard drive with a "zero-write" [this would securely erase any personal info] - you could use either the diagnostic utility from the hard drive's manufacturer, or a program like killdisk or Boot & Nuke --- http://www.download.com/Darik-s-Boot...ml?tag=lst-0-1
2) repartition & format the drive with a Win98se bootdisk from bootdisk.com --- http://www.bootdisk.com
3) copy the Windows 98 .cab files onto the hard drive
4) install Windows by double-clicking on the "setup.exe" in the Windows 98 installation files.
5) install a free antivirus (like AVG 7.5), and Windows Security patches up to mid-2006 (when support ended) -- they are still available at Windows Update.
6) install any other programs you wish to donate along with the old PC.
Best of luck with your project
. . . Gary
[P.S. --- Ahoy there, Mr Sparrow: by old Davy Jones bones, Win9x doesn't have Administrator accounts (or you might say everyone is an Adminstrator) -- Permissions and user rights arrived for the NT kernel Windows: WinNT/2000/XP/Vista]