Ok so if you think you have been infected
Usual causes of being infected:
Your system as slowed down which this may have been caused by a botnet server.
Your accounts are getting hacked usually a remote rat or a keylogger you have been infected with.
Unusual activity.
Bad virus opening pages doing things your computer should not be doing.
Okay so you want to get rid of your infection?
I have wrote a tutorial here http://thehackerscrib.org/showthread.php?tid=7 which usually gets rid of the causes of infection or viruses if this doesn't get rid of your infection then feel free to post on the forum so i can help you get rid of it.
Thanks for reading thehackerscrib.