JSI Tip 0574 - When I right click on an .INF file, I am not offered an Install option.

Use Regedt32 to verify that the following registry entries exist:

HKEY_CLASSES_ROOT\.inf
     Value Name: <No Name>
     Data Type : REG_SZ
     Data : inffile

HKEY_CLASSES_ROOT\inffile\shell\Install
     Value Name: <No Name>
     Data Type : REG_SZ
     Data : &Install

HKEY_CLASSES_ROOT\inffile\shell\Install\command
     Value Name: <No Name>
     Data Type : REG_EXPAND_SZ
     Data : %SystemRoot%\System32\rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 %1