Virus (?) slowing down the entire network ?

Hi, my problem is following:
about a month ago, I started to have this issue. Whenever i plugged my macpro to the internet, the speed of entire network had rapidly slowed down. Other computers in the house had fallen to an extremely slow download/upload speed, but my mac speed remained quite well working (except the ram memory, which was in pretty low numbers). When I unplugged my mac from the connection, others' speed went immediately up.I called my network manager, and they told me that my network is sending 500mb to the internet, although any of my computers wasn't sending anything (visibly of course).
I identified it as a virus, so I launched my Mackeeper antivirus, but it didn't find anything! I desperately decided to reinstall the software (the mountain lion version). (maybe it's worth mentioning that I didn't reinstall it from the cd, i didnt get one when I was buying it, it has it somehow installed inside). When I reinstalled it, I once more upgraded the system to OS Mavericks. After these two reinstallation, I again ran my Mackeeper antivirus, and it finaly identified some kind of virus. I eliminated it and for about two weeks it went very well. But now its happening again! I dont want to reinstall my mac, and my Mackeeper isn't finding anything again. How to get rid of it? Please help!

I like the Mackeeper abilities, like cleaning the disc or finding your mac when stolen, ect..
That's a bit like saying you like the fact that your doctor can get rid of the bad humours in your blood by leeching you.
Macs do not need cleaning, and in fact, overzealous cleaning can cause performance problems or even damage to the system. See The myth of the dirty Mac.
As for locating your Mac when stolen, you should know that your Mac can do that already. If you have an iCloud account set up, just turn on Find My Mac in System Preferences -> iCloud. It reeks of scam for a program to require you to pay for an ability that your Mac already has.
All the features of MacKeeper can be done just as well or better by other free or cheap software, and the company behind it has a long history of unethical behavior. It's not something you want to be messing with.
Ultimately, it's your choice, of course.

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