That's unsettling.
It's possible they were installed as part of a Trojan, but it's also possible they were put on your computer by someone else with access to the machine.
You know more about who has access and who would want to do such a thing than we would.
I found the Ardamax logger in the PestPatrol pest encyclopedia:
http://www.pestpatrol.com/pestinfo/a..._keylogger.asp
You're using McAfee, which is good because it alerted you to the issue. We have a list of more programs that can help, including a Keylogger Killer in our Spyware Guide at:
http://www.intranetjournal.com/spyware/removal.html
The guide also has information on prevention:
http://www.intranetjournal.com/spyware/prevention.html
It would be wise, once you have the programs removed to change your passwords and keep an eye on any online accounts to make sure nothing was compromised.