sah agent, name changing exes..etc [hijack this log included]

Hi all.

NB- I have tried to explain the whole problem in good detail- feel free to skip to the Hijack This log- Thanks in advance for any help..

Im so furious but also upset at the moment. I started getting popups a couple of days ago but today when I lost about 3 hours of hard work because of a bundle of popups clogging up my system and forcing me to restart, I was almost crying.
Now I am livid. I am usually a safe surfer and only recently reinstalled windows- Im wondering could it be anything to do with limewire or flashget? - either way its too late now.

Here is my problem..
Im getting popups- lots of them- mostly to gambling and sex sites but also to registry cleaners and other cynical advertising- every time i start explorer or otherwise every hour or so.

I have ran adaware and spybot and stopped the process' they advised.- yet still I have the problem-

To make me even more worried, I installed Winpatrol, which seems like some nice software, and every 5 minutes I am getting notice that a new auto start up programme has been detected [in windows\system32]- and it keeps changing to random names!!- it is instantly recognisable by having a version of 0, 0, 7, 0 -

In Winpatrol - the start up programmes section- when I remove a suspicously randomly named execution, it is usually instantly replaced by another suspicously randomly named execution!!!!!

In my +- programmes list I have "Shop At Home" [sah agent] which when I try to remove I get an error saying "cannot delete * it may have already be deleted"

My home page is also being changed to google. I have tried stopping some processes in Hijack This but am scared I might do some damage.

A total system restore would be a last resort Id rather not take.
Please please at least have a glance and see if theres any way you can help me.
Here is my Hijack this log:

Edit by chaslang: Unrequested inline log removed

I can honestly say right now if you put someone in front of me who has anything to do with this scumware I would happily kick their butt. These people have no morals whatsoever. Dont they realize how much suffering they put people through?? And the [bleep] and gambling that is forced on my screen could just as easlily be forced on an old person or a young child. Its sick and immoral and wrong.

Please help. If anyone can help me I would be so greatfull and would gladly return the favour with any assistance needed as far as graphic or sound design goes.
Thank you for reading.