The Security Mentor

According to PC inventory management company Assetmetrix, reported in The Register, 75% of the Windows PCs in business haven't installed XP Service Pack 2. SP2 came out last August. Are people afraid of incompatibilities? Assetmetrix also reported that about 10% of SP2 upgrades have problems. If you have a problem, it's most likely with some poorly written custom application which you should get fixed anyway.

That number means that 90% of SP2 upgrades go off without a hitch. Those odds are much, much better than running an unpatched computer. Go for it.