Hi,
I have (or perhaps "had") the same issues with my Sprocket download.
But I may have a solution. Try going to control panel-system-advanced-error reporting-choose programs and then add the ARMA.exe to the "do not report errors" list. Do the same in the system-performance-data execution prevention and add the arm exe as an exception.
May be (quite possibly) it is just me but I have just played on line for over 2 hours with no CTD and previously I would CTD every few minutes.
Please can you let me know if it helps as it seems to for me.
Lawyer