Suspected Malware slowing computer and Download speed?

I've done a little research and found out that certain malware on macs can be obtained through certain downloading sites. My computer is becoming slower and slower and download speed is being affected by something ( tested speed 2.3MB/s but the speed im getting is 40-100Kb/s ) both of which seem to be traits of malware or other viruses? Download speeds used to be higher and are still high other macs on the same connection. Ive tried downloading and running BitDeffender Virus Scanner and it found 4 problems, 2 of which where deleted, 1 quarantined and the last roams my computer free, but nothing improved anyway. Is my iMac infected, if so how to i remove the infection?
( its only 5 months old and is running 10.10.1 if that helps)

Please provide an EtreCheck report of your computer. However the first thing I will tell you is to uninstall (following the developers instructions) any antivirus, cleaning or other third party maintenance applications. Not only are these 100% useless some (most antivirus apps) tend to create more problems than they solve. There are zero viruses for OS X, however there is some malware out there that antivirus will not find. To avoid the small amount of malware out there takes just a small amount of common sense.
Common sense primer!
NEVER download from a torrent! Next do not fall for any popups, ads, e-mails or phone calls that advise your computer has been compromised. These are SCAMS!!!!!!! Next is do not download anything from a site you do not 100% trust. That's it, it is that simple.
Finally keep your Mac up-to-date!!!

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After a firmware upgrade, you must reset the router to factory defaults, then setup the router again from scratch. If you have not done this since the last firmware upgrade, then please do this now and see if it corrects your problem. If you saved a router configuration file, DO NOT use it --- you must setup the router from scratch.
If the above does not correct your problem, then the most likely cause is simply a poor wireless connection. This can occur even if your computer shows "5 bars" or "full signal strength".
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First of all, give your network a unique SSID. Do not use "linksys". If you are using "linksys" you may be trying to connect to your neighbor's router. Also set "SSID Broadcast" to "enabled". This will help your computer find and lock on to your router's signal.
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Poor wireless connections are often caused by radio interference from other 2.4 GHz devices. This includes wireless phones, wireless baby monitors, microwave ovens, wireless mice and keyboards, wireless speakers, and your neighbor's wireless network. In rare cases, Bluetooth devices can interfere. Even some 5+ GHz phones also use the 2.4 Ghz band. Unplug these devices, and see if that corrects your problem.
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If the above does not fix your problem, download and install the latest driver for your computer's wireless adapter.
Some users have reported improved wireless performance by switching to WPA encryption.
If you continue to have problems, try the following:
For wireless n routers, try setting the "n Transmission Rate" to 162 Mbps, and the (wireless g) "Transmission Rate" to 54 Mbps.
If you still have trouble, download and install the latest firmware for your router. After a firmware upgrade, you must reset the router to factory defaults, then setup the router again from scratch. If you saved a router configuration file, DO NOT use it.
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tt2

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Suspected Malware slowing computer and Download speed?

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