How would find out if you have a keylogging trojan on your computer?

[closeupready]

And separately, what is the best, cheapest way to scan your computer for unwanted spyware, malware, etc.?

[mdmc]

1. I do not know

but would like to..

[coffeenap]

2. An answer to the second question--f

free and available for downloading is Spybot--works great for me.

[closeupready]

3. Will try it, thanks - I had Avira, but it gave all kinds of false positives

so I uninstalled it.

[Capn Sunshine]

4. Kapersky.

http://www.kapersky.com

Best I've ever used, but slows down web browsing.
Also, Microsoft's security suite but you need to be running official Windows software, not a copy.

[Deja Q]

6. +1, Kaspersky

Oh, Windows, half the time, needs to reactivate itself or declare legitimate owners pirates...

[Crabby Appleton]

5. Malwarebytes - MBAM

http://www.malwarebytes.org/mbam.php

[Raffi Ella]

7. I use that one

and this one: http://www.superantispyware.com/

Also "hijackthis". It tells you what is running on your computer. But you need to know a little about what's what on your computer to know if there's anything suspicious there.