Yes you choose, what you think worse, i think spyware can be the worse as it can really slow down your PC and do other harmful damage to your system.

Hello, samuel3

Malware encompasses the other three....
Billy3

EDIT: I would have to say Rootkits

Worst is probably Trojans, but Adware is reaaaaaalllly annoying....

All of them!

Keyloggers is my main fear though - steals passwords and banking details!

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I certainly agree with your view David28; and when all of these are running through our system, they seem to have the ability to use our computers for their own networking. I have witnessed a key logger using my system to move and add these malicious programs from/to and throughout my home network. I have learned that the only safe system is one that is not "netted." I'm begining to wonder if there is some of the "companies" crreating these programs so we would have to BUY the antidotes.
I have a friend who is starting to develope free antidotes. He has assured me that he will be offering these solutions for forums such as ours to use; and if they work, then he will incorperate a freeware site sometime in 2010. His endeavor is one I'm praying for, and his will be a gift we can all use. We are tired of paying for something that is not our redpondibility- the annual subscription rates for these current antidotes are begining to eat more than their share of some peoples budgets. When the last set of these programs ate my drivers, I was looking for my last bullet to put my poor computer out of its' misery.

All the stuff is aweful brrr But after my computer had some Trojans - hate them!!

My vote is for Trojans. The worst thing ever!

I hate adware with a passion. I can be looking a game site and then all the suddon BOOOM. Im hit with a million different popup thingies.....

Trojans,

There is nothing worse.