Hello Again;
I found the culprit!
I scanned my hard disk with "sfc" (per instructions I found in this forum) and sfc tagged my file "CNBJ2530.DPB" as corrupted, but it could not fix it. Even though I have another healthy Windows 8.1 on a laptop, it turned out that changing that file would be more challenging (because of permissions, etc.) I could not even change it in "safe" mode.
In digging further, I read in a column that "Memeo" backup program could be the culprit. But I had used this program on another WIndows 8.1 with no problem. Then I noticed Memeo installs an extention to "Windows explorer" as well. I removed that program (through Programs and Features" and the problem went away.
So, for those of you who are facing this problem and have installed Memeo, removing that particular extention of Memeo could sovlve your problem.
The rest of Memeo is working fine for me.
PK