I have xp and this worked for me. Hope it works for you.
Ok for everyone NOT to get d/c. Follow what i say and there shouldnt be no more d/c.
Go into your nexon folder then combat arms then your HShield folder. Put all of the following into a diffrent folder AFTER you start up Combat Arms and are at the login screen (DO NOT LOGIN YET).
Folders to put into a diffrent folder-Update, HSUpdate.env, HSUpdate, AspINet.dll, HSInst.dll, mspatcha.dll, V3Ine***.dll, AhnUpCtl.dll, Bz32Ex.dll, psapi.dll, v3pro32s.dll, AhnUpGS.dll, EHSvc.dll, V3Hunt.dll.
Now after all those files are put into a diffrent folder (you can make a new folder in the HShield folder you dont have to make a new one out side of it as long as there in a diffrent folder) then you log into Combat Arms.
But everytime you close out Combat Arms put the files back BEFORE you try to start up Combat Arms again and repeat. Let me know how things work out. Happy hacking Tinnytim