Did you install a new software recently? Maybe an add-on or something that interacts with Windows Explorer. Frankly I never heard of such a behavior, did you search on google for any known issue about this?
In any case, you could try a system restore prior to July 22.
I did not install any new softwares. Also i got to this site after searching in google.
I also did a system restore right before writing this article
didnt solve the problem