Sweex Lc000070

Sweex LC000070
I have a problem with my internet connection! At startup of Windows Vista my laptop connects propperly to the internet. But sometimes after a while my connection goes into a limited connection and I have to restart my laptop allover to regain connection, it's really bugging me! And when I search for my wifi-connection it doens't show. On their official site they said I have you have to enable 'Renew IP Forever' but it was enabled so that wasn't the problem; I'm also yousing the lastest driver: R197e5a, so that's also not the problem, maybe it's not vistasupported? I'm using A dynamic IP, I'm going to switch to a Static IP, but I think it's not the problem! Anyone has any solution?

OFFICIAL SITE (http://www.sweex.com/LC000070)

Thank you in advanced, you'll be a life saver ;D!