Do you have a specific error not covered here? The CS 1.6 community on Windows 7 remains active on Discord and Reddit. Search for "CS 1.6 Legacy Support Group" to find configuration masters who have kept this game alive for two decades.
Installing Counter Strike 1.6 on Windows 7 is relatively straightforward: counter strike 1.6 windows 7
For a significant FPS boost, set your color quality to 16-bit . This reduces GPU load while maintaining visual clarity. Do you have a specific error not covered here