For the past week my Macbook pro downloading GB of unknown data  - is anyone else having this problem?

At first i thought someone had hacked my router - so i accessed my router set up and changed the password - when i checked by DHCP list howerev the only computers showing were all the ones actually used by myself and my housemates.
when i looked at the router history it showed in the past 24 hours my macbook pro had downloaded 7GB of data throughout the day and night all i had been using my Macbook for at the timewas writing word docs and checking some pdfs and occasional browsing with safari.
Nothing that would consume anything like 7GB of data.
the next day same issue - this time consumed something like 6 GB of badnwidth...
I look on my MacBook downloads and see no reference to what it is supposedly downloading.
I have run Mackeeper and Virus Barrier and no malware or virused were found.
I unchecked the option for automatically checking for updates... Still the problem is occuring...
Am quite new to mac so not sure what else to do...
Any help?

Look at this comprehensive trouble shooting document;
https://discussions.apple.com/docs/DOC-3353
I suggest that you start with SMC and PRAM resets.
Then  a Safe Boot.
Ciao.

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