Network Adapter (by 2 users)

We have an integrated Network adapter. Everything was working fine until we picked up a Linksys wireless router. Before connecting the hardware, it tells you to install the cd first. So we did. Afterwards, the programs that was installed was trying to run, and it gave us and error telling us that there were no Network Adapters found. I looked in the device manager, and the network adapter was gone completely.
I tried a system restore and that did not work. Would not allow the computer to do it. I purchased 2 PCI Network Cards and tried to install them, both were recognized by the computer, but after installing the drivers they would come up as unknown in the device manager telling me that windows couldn't install the drivers correctly.
I have scanned the computer with Norton, and AdAware, and nothing came up.
Is there a way to install the drivers only, without having to do a system restore?