i hav discoverd the problem and solved the problem with help of sum1..i would like to share the solution if any1 in future encounters this problem

the problem was actually not my computer or router problem
it was the ISP who provided a DNS Which does not work

i asked them to provide a new DNS and i used that on my IPV4 settings preferd DNS and it worked fine...can open gamespy.com and all the games works fine


but i really dont why my old DNS didnt work for gamespy.com!!
my possible explanation is some how gamespy.com blocks tat DNS or tat my DNS was banned


hope this helps any1 in future
cheers
thnx to members who replied to my post and MOD jbennet for helpin wiht new ways to approach