Before you update to XP SP3

[BarTopDancer]

Check out some of the reported issues.

Below is one. There are more all over Google Tech News.

Issues with AMD parts

An issue with how the Service Pack 3 update handles AMD chips will cause some Windows XP computers to continuously reboot. Microsoft says it is investigating.

The issues come in two forms: The first affects some systems with AMD chips and OEM XP images, while the other seems to affect certain AMD motherboards. Microsoft is looking into the problem and said it will advise when it has a solution.

There is a chance that the first issue could occur on some Intel machines as well. This is due to the same image being used on that machine, which is actually more the manufacturer's error than it is Microsoft's.

More in the link.