Exactly whch R11 (R3-131T-xxxx) is it ?
OK something you said back at the start does not make sense:
"CPU and memory is less than 5% used."
Just loading the OS uses about 2GB of memory so Task Manager should show memory use around 40-60% for a 4 GB machine. That also says (CPU) the processor is not doing anything. Something is very wrong.
ps just checked and running win10-64 Anniversary with IE, WORD, and Excel open am at 2.8GB (38% of 8 GB) used and CPU is sitting between 9 and 24%