Hammer,
The slow XP boot was on my old PC - an Asus A7V266 m/b with an Athlon XP1800 CPU. Windows was XP professional, SP1. No unusual hardware in the PC, no other software of any description installed. Settings were default (it was exhibiting the problem on first boot after installation)
Windows would come up in about 30 secs, however, if I tried to launch anything - or even shut it down immediately, I had to wait about 3-5 minutes before anything happened. During the wait, there was no hard drive access. After the wait period expired, there was some hard drive activity, then the selected application would launch. Subsequent attempts to launch applications would be normal, with no wait period.
Now that I have a USB flashcard reader on my A4000, I no longer have a need for Windows, and I have since broken that PC up for parts. The only operable PC I now have is a Bridgeboard in my A4000, which is used only for burning EPROMS.
Maybe I have some sort of "aura" when it comes to PCs - I just have to look at one and it will crash!