I have re-installed XP Pro three times now - the first time was the day I got the laptop (it came with XP Home and I wanted Pro) and then twice last night. Each time I've installed all the drivers and utilities that Dell supplied me with, and have also gotten the latest stuff from the website (using my Service Tag) so I know I've got the latest everything. I've also tried not using the latest everything, just a standard XP Pro install and nothing more, but I get the same issues: overheating CPU and 20 second CPU spikes.
I'm using the AO7 BIOS, which was already on the laptop and there are so far no updates to it. I've downloaded the BIOS from the Dell site anyway but it did nothing, they're the same version. I've got Quickset too.
I've also got two files from the site:
<a href="http://support.euro.dell.com/uk/en/filelib/index.aspx?sid=INS_PNT_P4_5160&cat=0&os=WW1&dev=1134&devlib=27">R58370 - Intel Mobile Chipset</a>
<a href="http://support.euro.dell.com/uk/en/filelib/index.aspx?sid=INS_PNT_P4_5160&cat=0&os=WW1&dev=6044&devlib=27">R79460 - Microsoft Mobile Pentium 4</a>
The first one works fine and installs, but the second (Mobile Pentium 4 Driver version A01) tells me "This computer does not support this operating system" and doesn't let me go any further, it just gives me an Ok button. This is definitely XP Pro, with SP2, and this is a brand new laptop, designed for XP, so I don't see why this is happening.