Very slow transfer speed between 2 computers in the same network

I recently bought a new laptop (Lenove G510) with win 8.1 pre-installed.
When i download files of the internet, my speed is ok, for wireless, but when tranfering files between computers (The other computer is a win 7), the transfer speed is really slow (2-4 MB/s). The transfers takes forever, and are relly unstable. It bounces from 1 - 4 Mb/s all the time and will not stabilize.
The same applys when streaming to other devices (Media Center). The video being streamd will just go frame by frame, and it is no fun watching...
Why is my transfer speed in local networsk so slow?? How can i fix this?
I use AVG Anitvirus, and I have tried disabeling it before transer, whitout results...
I have also updated BIOS, Chipset and the driver for the wireless network card...
I can also mention that when I turn my computer on, the internet connection is lost to all other devices... I then need to reset the router, and then the connection is fine again. This was never a problem before I got Windows 8.1, and is not a problem while the computer is turned of.
In advanced, thansk for any replys/tips
Regars, Morten

Just to be sure it's set up properly, please work through the steps on this page:
http://homepage.mac.com/rfwilmut/notes/sharing.html

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kentannahill wrote:
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rccharles wrote:
All are connected to the C-Net Wireless-G Router.
My iBook is on the Wi-Fi zone (All have 10.4.11) and I can see the computers on the Ethernet area,
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!http://farm3.static.flickr.com/2575/4090068351_6fb8dc3d55.jpg"!
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!http://farm3.static.flickr.com/2506/4090068193_7566e620cf.jpg!
I will try this
Message was edited by: rccharles

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Very slow transfer speed between 2 computers in the same network

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