Not sure about upgrading to Win 10, but this is indeed a laptop, HP ZBook G2. I've never heard about the Optimus issue (will investigate later), but given that now I can at least use the 32 bit version (stupid of me for not trying it sooner :facepalm:), I wouldn't want you to lose any more time on t...

Darn, not much help, I'm afraid: petoluk.exe Starting... CUDA Device Query (Driver API) statically linked version cuInit(0) returned 999 -> CUDA_ERROR_UNKNOWN Result = FAIL (Run as admin.) :( EDIT: So I guess it's not a problem with DGDecNV as such... But how come the 32 bit version still works... :?

Okay, it seems the 431.60 won't work with Quadro, so I'll stick to 426.00. There were quite a few older "backup" copies of nvcuda*.dll in the various system folders, but DDU got rid of them. Unfortunately, even after the cleanup & reinstall, the error is still there. :( And I do run the .exe as an a...

I just updated to 426.00 (the version I had before was the latest Quadro-specific driver, the QNF), the error persists. I don't see 431.60 when I select my card, but I guess I can google it - will report back shortly...

I've been using the x64 version since I purchased the tool in 2015, that's why (until yesterday) I didn't even think of trying the x86... Here's some info about the card from the NVIDIA Control Panel: Driver version: 426.00 Driver type: Standard Direct3D API version: 11.2 Direct3D feature level: 11_...

Thanks for tip, but it didn't help.

Interestingly enough, I just found out the 32 bit version works (didn't try that before, as I've always used x64).

So at least I'm not completely stuck...

OS: Windows 8.1 Pro x64 GPU: Quadro K5100M DGDecNV: 2053.0.0.165 (64 bit) I started getting the "cuInit failed (999)" error a while ago, couldn't figure out why / what changed (I suspect Windows Update). I tried updating the NVIDIA driver, and switched to the latest DGDecNV build, all in vain. Any i...