CGMiner/Multiminer difficulties: Connecting to pools properly and device detect

[Dopaminergic]

Hi,
First thanks to anyone who helps out.
When running CG Miner, connecting to gld.cryptocoinmine.com:2020, it appears to connect correctly and begin working and I get "Stratum detected now block" every few minutes. Despite this on the cryptocoinmine website even after half an hour there is no visible Khash or shares. I get "Error -1: Getting device IDs (num)" right when starting CG Miner and I am not sure what problems this is causing. I am using CGMiner 2.11.3.

I use Vista and an NVidia GTX 280. I can mine LTC fine using guiminer-scrypt 0.04. I have mined BTC with guiminer with no issues in the past.

When trying to run Multiminer on this computer and on my laptop, neither detect any useable devices.

I am really keen for any help/advice, and please let me know if I should post any other information. Thankyou in advance.

[HellDiverUK]

A nVidia card mining BTC will be so slow you're unlikely to be able to mine anything, ever now.  Difficulty is so high that any share your card might get will most likely be stale long before the card does anything with it.

Even a top-end ATI card (which can mine unlike nVidia) is pointlessly slow now.

Heck, even my last remaining Block Erupter at 333MH (about 10 times faster than your GPU) struggles to mine properly even at Diff 1 shares.