I didn't install any updates from the fresh install of windows pro 64 bit, and I still had the problem on the machine I'm using now. I used the sysinternals autoruns to remove useless startup programs as well. This fixed the problem of viewing thumbnails of images.
Now, last night I performed a search of on one of my drives of all 2D .wmv files, and the problem returned. I have icons, but not thumbnails. I can open the performance monitor, look at the memory tab, and see a dllhost.exe process is growing like a monster on steroids. I tried to delete on one of the 2D .wmv files and my computer had to think about deleting this file for several minutes. While I had the performance monitor open, I ended the dllhost.exe process tree several times, till thumbnails began to appear, and the deletion was quick, once I ended the process tree of dllhost.exe several times. For now, I can keep playing whack-a-mole with dllhost.exe, by ending the process tree if I'm reviewing .wmv files.
*Problem isn't solved, my apologies to all.