If you think you have maleware on your sites and you want to check to see if it has been flagged by google go here
http://www.stopbadware.org/home/reportsearch
If you have any of your sites flagged by google go here and these guys will help you get it unflagged once your site is clean, They will also give advice on what to look for and how to get rid of it.
http://www.stopbadware.org/home/index
If you think you have maleware on your computer here are a few free programs that are pretty good
http://malwarebytes.org
http://combofix.org/
I have the paid version of nortan antivirus on my computer and I still had maleware on my computer which norton did not pick up using a full scan, however stopbadware did pick them up..think I will run both programs and not just rely on one antivirus program anymore.
Hope you find these links hellpfull
