If you are using the Steam version:

Before fixing the issue, it’s essential to understand the culprit. serverbrowserdll is a dynamic link library file used by older GoldSource engine games (like CS 1.6, Half-Life, and Day of Defeat). Its primary functions are:

The message "serverbrowserdll unloaded" means the game has terminated this library mid-operation. On Windows 7, this is rarely due to a missing file. Instead, it is typically caused by:

Even though you’re on Windows 7, forcing compatibility helps:

Run Command Prompt as Administrator and execute:

regsvr32 /u serverbrowser.dll
regsvr32 serverbrowser.dll

Then restart CS 1.6.