do i need a firewall software when i already have a router (which acts itself as a a firewall)?

depends what you are protecting, and what kind of protection you are after

well my computer and all its data i d say...havent had a problem though so far ..but i was wandering if to have an extra firewall software would b meaningful ...

look at it this way: your router will stop anything that is trying to "knock on your doors", like worms and suchlike, that spread on their own. but it will not help if you get a virus/trojan by downloading it yourself from some unsafe website or email, because those would reach from within your system outwards, trying to send out data. in that case a proper firewall software, as well as an antivirus are what you need.

agree.

outbound stuff from your pc is a problem, comodo or zone alarm are fine. i prefer zone alarm pro...