Networking/routing assistance?

This question seems to be a split of games and networking alike, regardless, move if necessary, I apologize for the inconvenience if so.

So, had a router for a long time, but it's recently causing some serious interference issues with my gaming via online, connecting, and viewing servers through incoming and outgoing ports.

Can't view servers on counter-strike source or many steam games at all, including cs:GO , doom (sometimes) and it's just very clear its in correlation with the router.

I am Directly connected to the router via ethernet cable...
-No antivirus installed
-Windows firewall and protection systems off
-Any protection/firewalls disabled/off

Router model: NETGEAR Router 54 Mbps Wireless Router model WGR614v8 2.4GHz 802.11

It's to my understanding that there are many registered network administrators and tech's within this community, so if I can ask of anyone's person to person assistance , that would be greatly appreciated in what steps I should take to get rid of this issue.

(Already tried portforwarding and disabling uPnP to no success, perhaps I'm missing something... - additional details)

Personal instant messenger preffered method of communication: Xfire, steam, skype...

Thank you in advance,