just trying to get this older computer on the network is a pain.... won't connect to the internet sometimes even with multiple restarts.... when it finally does connect it doesn't stay connected for very long maybe enough for 2 maybe 3 refreshes of a website before disconnecting from the network and that's using built in wired, usb wireless card and a usb to ethernet adapter.... all of them do the same thing this computer was a beast when it was built... it's running windows 7 Pro x32 with dual dual core xeon CPUS and 4 GB of ram (1.99 GB usable) with enough room for 5 3.5" HDDs  SATA 1 maybe?

other COMPUTERS on the network run just fine with no problems at all

this is really frustrating as this computer is both my HTPC and NAS... just want it to workcheck the IPv4 settings and make sure the tick boxes are on automatically obtain IP address. control panel> network and internet> network and sharing center> change adapter settings> properties. If that doesn't work check device manager for any yellow explanation marks on any network related hardware that MAY be drivers causing  issues as well. Also when it is plugged in try and ping another IP address on your network that is working with CMD, that should tell you if it can communicate with local machines. If it does SUCCESSFULLY ping a local machine USE command tracert www.google.com that will tell you where the connection drops out.