The longer loading screen on the first launch of The Sims 4 after your console has been powered down is expected as your save files are being synched. So don't worry, your console hasn't locked up and the game hasn't crashed, just allow it to continue loading. Previously, this showed up as the "Press A To Start" screen…
Just to clarify, SecuROM is compatible with Windows 10, there was an article when Windows 10 came out (on Rock, Paper, Shotgun I believe) which incorrectly referenced SecuROM. The issue arises with SafeDisc, an old DRM method by Macromedia which Microsoft doesn't support in WIndows 10 and has also patched out in Vista, 7…