(half solved) how do i get free support from microsoft?

Hey everyone, a couple weeks ago i installed windows vista (may have been just last week, anyway)
And i was experiencing some trouble with the service pack so i opted to get support from Microsoft (i think i clicked a link within windows)
A few days later M$ replied to my email and offered their support, which was good, but by then i had re-installed windows and the issue was no more.
But now i have another issue, For some reason, when i leave my pc idle, the Dam Windows Defrag utility starts up and my harddrive doesn’t even need it, Also, it heats up the cpu allot, so when i come back, my only option is to reset to make it go away, and sometimes, a clean reset doesn’t work, and also, sometimes windows just gets stuck.
Anyway, Id appreciate if anyone can help me, but id really like to get some support from M$, BUT, when i goto their website and opt for email support, i eventually get to this>>>
Where do i find this product Identification number? Because the Product Serial key doesn’t seem to be the correct number.

Answer #1
Do you have a legit Vista?
Answer #2
i do
Answer #3
Control Panel > System…
The product ID will be at the bottom of the window…Just before where it says Windows Vista is Activated..
Answer #4
Thanks very much