R & R Studio completely broken for me - Session aborts every time. Tried everything, but no luck...

It looks like others have reported similar issues here before:

It seems one possible solution might be to run the 32-bit version of R?

Or if you recently installed MikText or other TeX distributions, you might try using an older version of MikTex or trying tinytex:

As far as I can tell it is a general Windows error related to admin privileges for an application, since most answers on StackOverflow and google related to that error code are unrelated to R.