this happens when u use SV and dont have multiclient... because when SV dc u there is still conquer.exe process running so u have to turn it off manually or install multiclient and it will be working fine
for beginners who doesnt know how to kill process just hit ctrl+alt+delete if u have animated welcome screen in windows xp it will pop up task manager else it will pop up menu where u choose task manager... now click on sort by name

ull find it easier and just find processes called conquer.exe kill all instead of running mainly u can see that running one is using more memory or cpu and when others are killed your co will be going fine

i hope this helped