rocxylemmon

I would try a bios update for the computer for any memery errors in the bios that may have been *fixed* with this device like an input/output error when all slots are used and a network card is installed then restore to bios factory defaults and make any changes that need to be made. Then look for chipset driver updates by Via if amd or Intel updates but of course you will want sisoft sandra program so it can tell you what kind of chipset you have so you get the right model for the software and then uninstall the drivers to the network card and install updated ones from the website...

Next is to try a diffrent network card by a diffrent company like d-link or linksys are some of the better ones out there and netgear is a low buget company and don't work that well when software isues are involved...

sounds a lot like bios problems so look for an update and I bet that fixes the problems as well as chipset software.....