Quick question.  If I have my firewall enabled on my wireless router, does that protect my computers on my network if I disable the ones installed on them?  I have my router firewall enabled, and the only way I seem to be able to get file sharing to work is by disabling the firewalls on the computers themselves.NO.
The firewall on your router protects for some sort of attacks, identity thefts etc, but not all of them. It is vulnerable to an "inside" attack. If you visit a compromised web page, than the illegal transfers will appear to your router firewall as NORMALS, for they will be initiated by your local computers and not the network attacker.

A very scarce answer, the right answer is much more complicated (and I don't know more, unfortunately).I think if you have your router firewall enabled your computers are PRETTY much protected.
The reason is that the router has its own hardware firewall installed that will protect your computer.  There's really no need for a software firewall program such as Comodo, Norton, or any other third party firewall software program.

I agree with Viking. Yep like Viking says, routers only protect against inbound attacks. It offers no PROTECTION against trojans and other types of outbound attacks. And seeing as trojans are probably the most common type of infection on computers today, I wouldn't live without a software firewall.
Note that the built in Windows firewall has very poor outbound protection, so get a decent one like ZoneAlarm or Comodo.Thanks for the info everyone.  I liked my norton 360, but it was giving me too many headaches.  I switched to zonealarm and that seemed to clear up my problems.One time I disabled the Zone Alarm firewall running on XP and I visited a few sites that test your firewall's strength. The firewall running on my Linksys WRT54G router passed without mention of any vulnerabilities.

http://www.hackerwatch.org/probe/

https://www.grc.com/x/ne.dll?bh0bkyd2

http://security.symantec.com/sscv6/default.asp?langid=ie&venid=symThis is because those sites all test for inbound attacks. I.e. attacks trying to gain access from the outside. Even the most basic router can protect against most inbound attacks simply because of the way routers work. (All unsolicited inbound traffic is BLOCKED by default simply because routers don't know how to handle it.)
But as I've already stated a router provides little protection against attacks coming FORM within a network such as trojans, email worms and so on. Your best protection here is up to date AV protection and a good software firewall.