Unknown software exception (0xc0000409)

when I open my pc an error message appears and my pc hangs

<<Unknown software exception (0xc0000409) occurred in application location 0x0100c01F>>

As for the problem you mentioned, from a general view , it seems that the
ASP.NET runtime on your deploy machine has encountered a fatal internal
error. I'm not sure whether your deploy server has meet any problems on
..net configuration before or has done any certain changes.

Try executing

aspnet_regiis -u
aspnet_regiis -i

command to reinstall the asp.net runtime in IIS. Then, try testing simple
asp.net pages in your IIS server to see whether it works.