I have the latest driver 375.70.  Previous drivers have left what look like files that MIGHT BE removed with CCLEANER.
NVIDIA INSTALL FILES 917,806kb. There are files under C:\NVIDIA\DISPLAYDRIVER\375.57.  More files in C:\ProgramFiles\NVIDIA CORPORATION. More in C:\ProgramFiles(x86) and C:\ProgramData.  I can't even find an entry for 375.70.
What/Where are those files that MUST be kept?