A spokeswoman for Wal-Mart announced yesterday that the chain will no longer sell Linux-based computers in its stores—apparently its customers far prefer the more familiar Windows operating system. In October, Wal-Mart stocked an inexpensive Everex machine, the gPC, in several hundred stores, but even with the low price tag of $199, the computer failed to keep pace.

Before you put that ancient hunk of plastic and silicon to work, you need to clean it up and lock it down. Cleaning old software off the system will help it run smoothly, and securing it will help avoid headaches caused by worms, viruses and other online nasties. Fortunately, you can do it all without spending a dime. Just follow this plan (for Windows XP and Windows 2000).

PC RevivalCost: $0-$260 Easy | | | | | Hard

Start by checking the health of your hardware with a free diagnostic program such as #1-Tufftest (tufftest.com).
If the motherboard or screen is shot, forget it. Replacing either one is more expensive and more hassle than buying a new system.
Lost your user manual? Try the manufacturer´s Web site.
Check eBay or craigslist.org for used replacement parts.

Tony Rose

Iqaluit, Nunavut, Canada

All computers lock up or crash, and no operating system is immune (as a matter of fact, we crashed once as we wrote this answer), but singling out specific reasons oversimplifies the issue, explains Daniel Jackson, a computer science professor at the Massachusetts Institute of Technology. The underlying cause, Jackson says, is that hardware and software developers are trying to bring products to market in "Internet time"-that is, hyperfast. The result: Quality and reliability suffer.