Linksys WRT120N Wireless Router "wmp54gs" Questions

i need driver for linksys wireless-g wmp54gs i this DRIVER FOR WMP54GS V1 http://www.linksysbycisco.com/US/en/support/WMP54GS/download DRIVER FOR WMP54GS V1.1 ...

...malware. I would like to just pull a complete system restore on it, but in the past my Linksys WMP54GS PCI Adapter has always given me trouble when I try to reinstall it. It always says

...a wireless adapter installed? The router box says for optimum performance also get wireless adapter WMP54GS but that has been discontinued. If I get adapter WMP54G will that work with this router? If ...