It can be related to "msvcr110.dll" file, try to copy it from GPU miner. In 1-2 days I will release another update to fix it.
this works!
Server 2012 R2
Works for me too on two rigs with Win 8.1
P.S
Claymore, did you reproduce the hashrate drop's bug after lost connection ?
It's old miner, so it's not a bug, v3.5 calculates total hashrate as "the total number of hashes processed" / "total running time". I will improve it in next update to show current hashrate instead as I do in other miners.