Although this link is to a how-to article called 'Remove Trovi.com redirect', it turned out to be a good way to clean up my machine from other crapware problems.
It gives links to four cleaner programs and tells what order to run them in.
It's recommended by malwaretips.com as a sub-link.

Tnx for the head's-up on Softonic.

-bit (April 01, 2014, 03:28 PM)

How strange... I just joined MalwareTips.com, and was cordially invited to post in the 'new members' section, and at the bottom of the page it says  (You have insufficient privileges to post here.)
For security purposes I would rather withhold my username there as of yet, but that is a very odd experience.
It did not say to look for an authentication email, nor did I get one, so I don't know what the deal is.
So I have 'membership' but no 'privileges'.

(edit) Okay they just sent me an email confirming my membership. Usually as a new member of a forum, you just get an email to click on a link, but they don't do it that way there.
Instead there is a 12 to 24-hour delay and then they just approve your membership.

(edit) Malwaretips.com forum has this special web page for assistance with malware removal.
The subsection has a 'Read Me Before Posting' sticky instructing to post your problem in a new thread, not someone else's thread, because it is very important for you to get advice specific to your own malware removal problem.
It also says it is staffed by volunteers, but the forum seems quite active.
Volunteers actually write executable scripts specific for unique user malware problems, but again, they say don't just use someone else's script or you could cause problems for your machine; post  your own problem and they will write you your own executable script at no charge to deal with your specific problem.
The ReadMe sticky there at the above link explains the whole thing in more detail.

I finally got my machine to work with the newer NVIDIA GTS 450.
It was an old installation procedure that did the trick.
My machine wanted to 'see' the old 6800 VGA card.

So to 'fix' it, one first tries to boot with no VGA card.
That makes the pc stop looking for the old one.
Then one reboots with the new VGA card, and now the pc can see it.
I thought that 'trick' went out with plug and play, but apparently not.

I run Malwarebytes on my Win7.
When I installed it in my WinXP, I think I merely used the same download to save time.
Both work fine.
I wonder now if I'm running the same install on both?