first of all I must admit, that I'm not good in all this network stuff.

I am using Windows 8 OS.

On my laptop (Lenovo G570) I have installed Windows Phone 8 SDK and shortly after this I started having weird issues with internet connection.

When I start my laptop, internet usually works fine, but after a few minutes it starts slowing down so much, that I'm not able to open a single page. Rebooting doesn't work, after several disabling and enabling network adapter, it usually works again for a few minutes and then again it stops.

I'm sure it has something to do with Windows Phone 8 SDK, because problems started with this.

With SDK there was also installed "vEthernet (Internal Ethernet Port Windows Phone Emulator Internal Switch)" network adapter.

It is worth to note that problems occur mostly in my school network, not at home.

Both at home and school I am using Wi-Fi connection.

I hope the information given are enough to help me.

Thanks in advance for any answers!