which type of problem slows computer the most malware, spyware, trojanware, or viruses ?

all the above!! But if i had to pick a top one I would have to say either spyware or trojans. But all of them can really hinder your computer (badly)

Spyware: Tries to gain personal information (credit cards, etc...)

Trojan: Attaches itself to a file and then tries to destroy the victim

Virus: A malicious program that was designed to destroy the victim, but be as preventive as possible to not be removed

Malware: All of the above

Malware and Viruses are pretty much describing spyware and trojans. So your question isn't "well-asked." Really, the question is between spyware and trojans, and I'd have to choose trojans.

Most computers actually run slow because of a hidden part of your system, which is constantly being used by Windows. This part of your PC is called the "registry" and is the central database for Windows, which stores everything from your latest emails to your desktop wallpaper. It's one of the most important parts of Windows and can easily make your PC run slow.The more corrupt registry files your computer has, the more it struggles to read them.The files which makes it run slower and slower. To fix this, you simply need to use a registry cleaner http://cleanup-comuter-run-perfectly.com/ . These are small software tools which actually work by scanning through the registry and fixing any bad files that are in there. This then allows Windows to read as many files as it wants, when it wants to.

Actually, rootkits. Those basically mass download thousands of infections. A deep, hardcore rootkit will install malware, spyware, trojans, and viruses.

Stay aware of spywares. they make the system slow this is because it is a back process. and when t2 process are running on the same system the system gets slow down .

use avg 8.5 and make sure its updated .thatz the best solution!!

all the best

trojanware i think so. You can know more here about computer security:

http://www.spy-cleaner.com/faq.html

Hope it can help. Good luck.