Unfortunately in this case AWS has not been qualified for Windows HMP 3.0 baseline as of yet. Its only been used for different PowerMedia XMS product which is Linux based.
However, since we do support VMware in general as a Virtual Machine software, I suspect it could be something with the actual VM platform configuration provided by AWS in this case where HPET needs to be enabled at physical server level and passed thru the to the VM configuration instance. I guess you would have to contact AWS on the likelihood of getting that done if possible.
Regards,
Jeff