number of XP installations?

[Un4given]

I know this will sound like a big noobie question (*sigh* not another one of those annoying noobs), but I have installed XP home on my computer 4 times, which required 4 activations obviously. But on the fourth one it wouldnt let me activate it, so I called in to the ever so helpful microsoft helpline and they let me activate it a 4th time because I told them that I had to reinstall multiple times because of virus issue(of course thats the real reason, u think I would lie to the all powerful god that is Microsoft?).
Neway I have come to the point where I need to reinstall XP yet again and its not letting me activate XP. I think I have used up all my activations. What am I going to do? I bought XP home legally and now its pointless. Do I really have to buy a whole new copy of XP home to get it to work?

P.S. Is it true that XP Pro is allowed multiple installs on the same machine without limitation?

[Mïcrösöül°V³]

just keep telling microslop you have a serious virus issue, or tell them your hard drives' SMART failed causing you to re-install on a new hard drive. I think as long as you give them the number of times you did it, you should be ok

[RoaringOne]

You just gotta keep calling them and telling them what is up. They can't tell you that you can't use your version of XP anymore, they will get you activated.

[eneuman]

all you gotta do is waste 5 minutes an call. never had them not tell me an activation number