Slow my cpu down

No. Look in your BIOS for something call speedstep. Not sure if the Pentium Ds had them back then, but basically your processor will run very slowly when it idles, gearing up only for when its needed.

i will reboot my pc and have a look in the bios

nope i dont have speedstep ... i have something call cpu TM it was disabled should i enable it and what does it do and is there any other setting i should check for ??

TM should be thermal management, I believe (I could be wrong). Might as well as check it, see what happens. Without being able to go into BIOS myself, I'm not sure if there are any other settings to check for. You can always try and change the processor's multiplier since you couldn't change the FSB any lower.

im running everest stress test with tm enabled i can see 30percent throttling and the temps are sticking at 85 degress so i am assuming that throttling slows cpu down at 85degress to stop overheating am i correct and my multipliers locked .... my bois is am bios

Throttling is an attempt to prevent a processor from over heating. It doesn't always work well, but it sounds like in this case it is working. Also use compressed air to blow out any dust in your system (including your heatsink on the processor). If possible, maybe buy a few case fans to add better air flow to keep things cool. Depending on what you get, you are looking at less than $10 for a fan or three.

Your processor is overheating because you either have horrible case airflow or a bad heatsink install.