hi, welcome to the forum!
(i like your name

)
the autosave feature works differently than in Oblivion, a lot more stable and shouldn't be responsible for autosave-crashes.
right now it can not be deactivated (i don't know if that changes, the system was only implemeted with a recent patch)
try turning on/off ENBoost, systems react differently to it. if that doesn't change anything, lower the graphic settings.
(there's a setting called "Stability Compromise")
and don't keep
to many saves in your save-folder (
..\Steam\steamapps\common\Oblivion\Saves)
if you experience multiple crashes in a few minutes of playing time, restart Steam.
not
all crashes can be prevented, simply because the Oblivion-engine is "overwhelmed" with Nehrim.
if you're still crashing to often, please upload a save, from the mentioned folder (two files, *.obse and *.ess)
hope that helps
