lease expires in an hour and cant get new IP

greetings everybody
i`m having a problem with my cable connection in college...when i start computer notebook it gets its IP normally but when lease expires in an hour than it`s impossible to repair connection becauce it cant get new IP...nobody has such a problem and i have no idea why its happenning...and when i restart my notebook than everything works ..but only an hour .. i tryed to disable firewall but helped nothing...must finish this because my lease expires in a few moments oh..and when i`m at home i dont have such a problem ..as far as i remember

 

I don’t know for sure what is going on with your computer or how to fix it, but nobody has responded to your thread for days, so I will through out a few ideas.
Try deleting and recreating your network connection. (Maybe reinstall your internet software)
Try flushing your DNS cache, then releasing, and renewing you IP address.

 

Make sure that all the Services on your laptop, and the Network settings are set correctly.