I didn't dismiss Ted Zieglar's reasons.
I just know it's not one or two beacuse I'm always scanning for
spyware/adware and editing my startup processes, so I know exactly what
my system is loading.
I was a bit unclear about my response to Ted Zieglar's post.
I meant to say I was going to look into his other reasons in more
detail, specifically step 5. It seems most likely.
This is how I stumbled upon the 'intelppm.sys' idea - by looking at my
processors driver.

Sorry about that, I'm still looking into some.
Anyway, I feel it was something relating to issues into that
'intelppm.sys' post, so I'm trying a few of the solutions I found
there.

One of the things listed on there was to change my pagefile size and
let it be 'system managed' (I had mine on custom) and, although it
might not solve this problem, it probably did some good anyway.
Another one was to reinstall your printer o_O I did that anyway, and I
uess the only way to find out if anything's worked is to wait til it
happens again

Anyway, by default, I have 28 processes running and CPU rests at about
2 - 8% when idle. Commit Charge is currently (with firefox, MSN signed
on and taskmanager open and background processes) at 220M / 2389M.
Umm, is there anythnig specific I should tell you which could help?
(and just in case provide details of how to get it, unless it's simple)

Another thing that popped into my head (very unlikely) is that it's my
webcam. It's always on, and I got this before I would've got SP2
(unless SP2 came with my PC - pretty sure it didn't) but it's just that
it's always on and never really doing anything.
I can turn it off by unplugging it, or, if I use it, it turns itself
off afterwards automatically.
I just updated the driver for that though. We'll see what happens.