I wanted to visit the original intent of this thread, since it was asked if it was a good idea to use the registry hack to continue to receive updates. The consensus seemed to be that it wasn't, and I have a hard time condoning that advice for a couple reasons:
First off, taking anything for granted, or with any sense of honour from Microsoft is a bit foolish especially when it comes to anything Windows XP. Remember, they would rather all of you abandon XP immediately and switch to v8.1, so Microsoft telling you not to use new updates via a registry hack isn't being said for your benefit; it's for their own good. They want XP to die: NOW!
Next, the codebase for the version of Windows that still receives updates (POSReady 2009) is identical to Windows XP x86. They are more similar than XP x64 Edition (which is based on Server 2003 code). So the updates are compatible; FULLY.
So the link that was provided telling you that Microsoft says not to hack the registry to continue receiving updates; that's a bit biased in Redmond's favour. Don't be someone who just takes whatever Microsoft tells you as gospel. It's the company acting in their own interests, and not yours.
Cheers,
Jody
Personally, I wouldn't seek to 'hack' into any updates, simply because I don't trust M$ not to install something intended to cause problems. We bought XP in good faith. For M$ now, to seek to undermine it in any way is not just poor business practice, it's dishonest.
I've heard, (read) talk that M$ plans to offer an update which will eliminate the need to register XP. If that does come about, then it will, at least, remove that issue.
I have to agree with Elizabeth here, XP doesn't need any updating. Security is better provided by thrid part products, Avast, Zone Alarm, Kaspersky's to name a few. It is now a stable OS, having been thoroughly updated, it is now a functioning product, which it should have been at the start.
I have W7 on a second drive and occasionally switch over. It is slower. The continual updates, many of which are of no concern to me, are utterly annoying. While I have managed to turn off a few of the unnecessary services, I can't at this time, risk turning off too many, simply because I don't know what M$ or others, may do in the future. COM+ is an example, of a major resource hungry service.