Mathematica 10.0 (10.0.0.0 latest available) doesn't start when called from start menu on Windows 8.1 x64. Kernel can be started separately and asks for activation, which works, after it I can compute, but Mathematica itself doesn't start - occasionally I see splash logo for a second, then it disappears with windows error, but mostly nothing happens at all.
Reinstaling, clean start, manually removing configuration files and turning off McAfee did not help me.
If anyone had this issue, please, reply.
Thanks in advance!