Hi, Joe.
If that used computer has nothing on it that you want to keep (and you are
entitled to keep), then the solution is simple:
Buy a full retail package of WinXP (either Pro or Home), set your computer
to boot from CD, insert the WinXP CD-ROM and turn on the power...and just
follow the prompts. One of the first questions is whether you want to
repartition and/or reformat the hard drive. Tell it yes.
If that computer does have programs and/or data that you are entitled to
keep, you can do an "in-place upgrade". This will take as long as a fresh
install of WinXP, but it will preserve the installed applications and data.
For full instructions, see:
How to Perform an In-Place Upgrade (Reinstallation) of Windows XP
http://support.microsoft.com/default.aspx?scid=KB;en-us;q315341
Of course, if the computer has an illegal copy of WinXP, then it may very
well have other unlicensed software, and there's a very high probability
that it also includes viruses and other malware, plus the prior owner's data
(even if he thought he erased it) and garbage. In this case, a fresh
install is the ONLY way to go, in my opinion.
After either a fresh install or an in-place upgrade, get a good firewall and
antivirus working and then, as soon as you can get online, go to Windows
Update to download and install the latest Service Pack plus all later fixes
to protect your machine from all the bad guys out there.
Better set aside half a day to do all this.
RC
--
R. C. White, CPA
San Marcos, TX
(e-mail address removed)
Microsoft Windows MVP