You are correct, Spybot S&D is a good prgoram and is free. Housecall that you mentioned is owned by TrendMicro and is a free online virus scanner. They would like you to buy the TrendMicro antivirus program but it is not necessary to do that in order to use the free online scan. This list here are some of the free ones that we recoemmend here. You already have the first one as long as you did not get a ripoff by mistake, there are many out there. Make sure that the one you have is the same one on this list.
Spybot S&D (download, check for updates, read the tutorial and scan often, it also does some blocking)
SpywareBlaster (a blocker only, download it, check for updates, enable it and leave it alone except for checking for updates occasionally)
SpywareGuard (similiar to SpywareBlaster but works in a different way and does not update as often for that reason.
Ad-Aware SE (a scanner, download, check for updates, read the directions and scan.
cwshredder (stand alone unit)(another small scanner for certain things, ALL other windows should be closed)
Also do an online scan at one or all of these.
On the first one, make sure you checkmark the box that says "autoclean"
Housecall (using IE with Active-X)
Housecall (all browsers using java)
I've been finding some mis-statements on the internet that are saying there are free scan & removal programs:
Spybot has a free scan and removal program.
There are 2 that as far as i can tell are free scan but in order too remove what is found you have to purchase the program. these 2 are-
Housecalls and spyhunter.
This is just to help people be aware before they go and download a program thinking they will have the removal tools and then finding out they don't.
If any one else knows of a program too add here it would be appreciated please state if the program has a free scan & removal version or simply a free scan version. Thank you!