Unknown folders on Drive "C"?

I have almost 300 file folders on my "C" Drive that have appeared from an unknown source.

Name examples:

1a73ede68382b425ae3f2b

fee433929e7eb729e7b928ed048482

Dates modified run from June 25, 2014 to January 17, 2015. It is possible that I missed one that may have been earlier, or later, but I believe all are from June, 2014 through January, 2015. I can't wonder if there were earlier which were removed by the same unknown sources.

All folders appear to be empty although I did not check all of them.

I run two computers side by side. These unknown folders originate on the primary computer in which I run FS9 and FSX. No such files ever show up on the secondary computer.

Both computers are running Windows 7 64bit Home Premium. Both are on a home network, so have access to the internet.

Seems that long ago I saw posts regarding these folders but I don't seem to locate them now. Can anyone tell me anything about them and is it safe to just go ahead and delete them and is there a way to prevent getting them?  It is a bit of a nuisance to have to scroll through them to find active files or folders.

Thanks:

RTH