Slow computer

My son downloaded a game called puzzle pirates and man was I ever having problems with my computer slowing down,hard time getting on the internet.
So I started running and doing all the checks to see what got into my system.
I ran ad-aware.spybot,ewido,microsoft antispyware,cwshedder,everything you can run,and I was still having problems with a slow computer.Almost everything I ran found somthing.So I thought I go ahead and try Spysweeper and see if I was missing somthing.I couldn"t believe what this anti-spyware found, a total of two trojans,and five adwares.Spyware sweeper said that It also found a hijacker in internet explorer where my settings have been changed and sweeper also allowed me to reset the default settings off the same progam.All I know right now is that my pc is running great and faster than ever.I only have the trial version of spysweeper.I'm not saying it is the best but it sure did help me.
The items sypsweeper found:Bonzi buddy,browser aid,gloogle aid (not google)
websearch toolbar,goldeneye,ieplugin,trojan_backdoor_retro64.
A lot of these came with the puzzle pirates download.I guess it shows you have to watch what you download no matter how innocent it may seem.