Well dude the problem may also rely on the version of counter strike.Some versions tend to run into connectivity problems.I have counter strike 1.6 original compact disc clone.I run it without installing straight from CD without installation and it has never denied me connectivity on the internet.Offcourse there is no network connectivity so there is no LAN for me , yet internet gaming works for me.An hit and trial solution for your problem might be a recommendation of change of your counter strike version.Rest its your judgement to make.