about viruses and their description

To know about different types of viruses,malware,spyware and keylogger visit the following url.
http://www.viruslist.com/en/viruses/encyclopedia.
Site Map : http://www.viruslist.com/en/map

To analyze a file which is in your system whether it has virus behaviour or not can be checked by vistiting the following url and submitting your file.
http://www.virustotal.com/
After submitting your file to  http://www.virustotal.com/ this can check your file with different anti viruses and tell the result.