Any DirectX experts out there

I'm having trouble with the directx part of the ngx install. I'm getting an error message there that directs me to the error log - where it says: setupiteratecabinet()error 32 the process cannot access the file becuae it is being used by another program. I tried both the web updater and the redistributable version on the Windows site. No luck. I'm driving windows7 - directx 11 Any help understanding what might be causing the hang up would be deeply appreciated. Colin