I am working on a Windows 98 system. It is connetected through a LAN and access the web via a proxy. For last few days the network of the PC goes down about 1.5 hours after booting. At that time it can not browse the network nor connect to the proxy. But after rebooting the PC the network connection is restored only for next 1.5 hours. I could not figure out the cause nor could solve it. can anybody help me?