Each PC user happened at least once to populate certain folders that contained certain files with Many children of those files. At least once. And every PC user knows how annoying It can be this and especially how annoying it is to delete each copy separately or select them all to be erased "at the pile", with RISK to create other children of children.
The reason for these multiplications of files is that Windows He understands that each file (or selection of files) should be copied) that is moved more than 4 pixels while clicking with the mouse.

What every PC user does not know, but only some of them, is that it can the remedy quite easily this "cloning" of files using the combination of keys Ctrl+Z immediately after it takes place or using the option Undo that you find in the hidden menu under the button of Edit (located in the left-handed corner of each folder).

Immediately after using this option, the dialog of delete will appear:

But there is Solutions for avoidance creating such "accidents". Users of Windows XP have 2 such solutions available:
1.Tweak UI - It's a utility that allows you to access Windows XP operating system settings (unfortunately not available for Windows Vista), settings that are not found in its default interface (such as those for mouse, explorer or taskbar).
After installing tweak ui, go to the menu Mouse and change the value next Drag at more than 4 pixels (however, not too much, so as not to happen otherwise after modification). This will help you prevent the accidental multiplication of files from a folder.

2. Modification of registers (This method is valid for both Windows XP and Vista).
Go to the button of Start, open Run, taste regedit.exe And give OK. Will open you Registry Editor, where you select HKEY_CURRENT_USER –> Control Panel –> Desktop. Between the entrances to the right side of the editor you have DragHeight and Dragon, whose value of 4 pixels is responsible for the accidental copying of the files. After changing their value (10 pixels It would be enough, too high a value can literally deactivate the option of drag&drop), the problem of "cloning" will be solved.

Careful!: Any modification of registers can cause problems of the operating system, so it is advisable to make them a backup before you change them.