No, that really wasn't what I was asking, I guess I was kind of unclear.
My question was whether there would be compatibility issues with newer routers and Windows NT. All of the datasheets and specs I could find about any current router on the market listed Windows XP or newer as a system requirement. However, most of them contradicted themselves in several places, so I was unsure.
Solution: I called Linksys and Netgear, and both said ALL of their routers support EVERY version of Windows.
This was relieving to learn, but it'd be nice if their datasheets weren't completely misleading.
Anyways, thanks for the input.