Windows 7: not recognizing school network

hey guys i am connecting to the internet using a school network but lately sometimes my computer does not recognise the network and when it does i can only connect to the internet for like only a few minutes. i have tried to change and network card and still same problem. i am the only one in the building having this problem. i am using windows 7. can anyone help me??????:c ry:

First can you fill out your system specs in the User CP page (Make sure to list what build of Windows 7 you are using (Windows 7 RC as an example)? Afterwards go ahead and update the drivers for your ethernet card

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