What is the full path name to the folders' location(s)?
Do the date and time stamps change?
(And your date format is DD/MM/YYYY - correct? April 2nd versus MM/DD/YYYY being February 4th. With YYYY being the year.)
If you right click the folders and select "Properties" what do you see. Who has rights to the folders?
No error messages or pop-up windows when you delete the folders?
Any recent software installs: new or updates/upgrades?
Have you run any AV or malware scans?