game very laggie and problems with rates HELP

[kamikaze_bad_ass]

hey guys i have a problem for the last few days i can't seem to solve
in zm mainly but really all games i am getting fps of around the 30's to 40's depending on map and players but real problem is my packets in jumps aroud from bout 500 or 600 pp to around 1200 and higher at times and i keep getting disconnected with this error msg: Buffer overflow in net message

not sure of all the tech stuff but can find if needed
but at the moment i'm running on windows vista
with windows firewall turned at the moment and avg anti virus software
anything else please ask me and i will find out

here's some screen shots to see what i mean

[khaotik]

This will remove all binding and custom configurations.. "rebound keys, name, changes in resolution, etc"

C/programfiles/steam/steamapps/yourname/counterstrikesource/cstrike/cfg.
Delete Config.cfg.
autoexec .cfg as well

[kamikaze_bad_ass]

thanks will try and get back to you on this