Hi Dan,
sounds good - the AVX warning is down to using a relatively old CPU (or at least one that doesn't support the most modern instruction extensions - this also includes some more modern CPUs designed for low price/power usage). If you try to use the more advanced features in SharpCap 64-bit after the AVX warning then SharpCap will crash - if that happens then you will need to go back to the 32 bit version.
good luck and clear skies!
Robin