I attached WinDbg to a running process and had the process crashed (I have a separate question re. that case). Once the program crashed, WinDbg stopped and allowed me to deb
Is the process which you are trying to debug a 32-bit? What does the task manager-processes listing say ? If its 32-bit process then you need to use 32-bit windbg.
Otherwise, I don't see why .load sos clr should fail.
ps: (windbg noob alert), so i apologize if this sounds lame. Just trying to help.