Windows Freezes 5 seconds after startup about 70% of the time

To start, I formatted my machine, installed Leopard, ran Boot Camp to set up a Windows partition, used a SP2 Windows XP CD, and started the Boot Camp process fine. Everything was good the first couple of days. Then however I very frequently found that when I start up windows, occassionally the mouse and keyboard would cease to be responsive and I'd be forced to hold the power button to reboot. I've noticed this happens at exactly the same time the brightness goes down 1 level so my best guess is whatever Boot Camp process is being started up is what's causing this.
Typically what happens is I'm in OSX, I click the Reboot option, hold down the Option key when I see the gray screen, then select Windows. Once I get a mouse cursor, I start moving it in circles and wait about 5 seconds after the desktop has loaded. If the mouse freezes, I reboot and try again. If it doesn't, I figure I'm good to go and continue using my machine.
Sometimes also around the same time instead of freezing it just immediately reboots the machine.
This problem is occuring way more than half of the time. Luckily it's only at startup and if I just keep trying until it works, then I can continue to use Windows without any problems.
I own a full version of Parallels and this problem has never occured when I start up my Boot Camp partition with that. I feel like that gives a reasonable amount of confidence to the difference in the Boot Camp service/drivers.
What can I do?

* Here is how I partially solve this annoying problem:
In activity monitor, one can clearly saw that Paralells 3 is jumping from one core to another (why is so, I do not know - perhaps they wanted to make similar thermal load on both cores).
Confirmation in syslog: an 19 07:06:29 aeroflot kernel[0]: [Parallels] IPI stat: rescheduled 1 cpus out of 2.
Removing vmmain.kext from kernel does not solving anything because Paralells requires this kext to be loaded in order to work!
1. Disable one core if you have dual CPU. This will resolve "core jumping" problem. The system will work with reduced performance, but since Paralells is still unable to use multiple cores, it might be less painful.
2. Try to avoid automatic loading of vmmain.kext during system startup when you boot both cores, or better, you can load vmmain manually when you want to work with Parallels 3.

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