decent.look, let me guide you. First, I hope you have the latest non-steam version, and a non-steam add-on pack installed, if you don't, just tell me and I'll send you the torrent. Your system specs seem fine to run CS 1.6. Jerks or lag usually occurs if you have a high latency/ping delay to the server. For a good online gameplay experience, your ping should be no more than 90-100 milliseconds (ms). The larger the distance between you and the servers location, the higher the ping. So try not playing on international servers. Thats why all Pakistanis play on local servers and this is why it's such a big thing PTCL has made a gaming server for PTCL customers to play on. And because it's in the same network, pings should be relatively low. So clear all your favourites, and enter PTCL's servers ip:port, i.e: 188.8.131.52:27015, 184.108.40.206:27016, 220.127.116.11:27017, 18.104.22.168:27018 or 22.214.171.124:27019
And exit CS, to save your changes. Open it up again and play on their server by double clicking on one of them.
If it is still jerky and laggy do this:
On Options/Settings, lower your graphical settings.
Optimize your network with SG TCP Optimizer: http://www.speedguide.net/files/TCPOptimizer.exe
Disable or make an exception for CS in your Firewall software (if you have any)
Close ALL downloading, especially uTorrent and LimeWire... EXIT them!
Close down all unnecessary background programs.
Play on a wired network and not wireless
And theres this one thing about TcpAckFrequency... For which I think this video pretty much cuts it:
- Follow it
And sorry for the long post, but I'm really bad at summarizing... Hope this solves your problem
EDIT: And oh, heres a list of gaming servers in Pakistan: http://www.game-monitor.com/search.php?game=all&location=PK&search=&type=server