Some people may find that the drag and drop of files in Photoshop may not work sometimes, For this issue you dont have to reinstall your photoshop. By doing a small change in the system registery file, we can fix it. So please do the following steps to fix it.
Step 1: Goto your search section on the Windows and type ‘regedit’. You will see ‘regedit’ Run command item. Click on it.
Step 2: In the regedit window, double click on “HKEY_LOCAL_MACHINE”.
Step 3: Then, double click on “SOFTWARE”.
Step 4: Then you will see a big list, find “MICROSOFT” and double click on that.
Step 5: Then find “WINDOWS” and double click to open it.
Step 6: Then double click on “CurrentVersion”.
Step 7: Then find “Policies” and double click on that.
Step 8: Then double click on “System”
Step 9: Now you reached the main menu area, Look in to the items available in the right side portion.
From that you will see an item named “EnableLUA”. Double click on that.
Step 10: Now a small window will be opened with the value for that item. You may see its by default the Value data set to be 1. Please change it to 0 and do not change any other value (keep base as Hexadecimal)
Step 11: Now click Ok. Its now updated. Now please restart your PC. After that try on Photoshop, if its working or not.