Can’t select multiple items after upgrading from Windows XP to Windows Vista
You cannot use keyboard shortcuts to select multiple items in Windows Explorer after upgrading from Windows XP to Windows Vista.
For example, you cannot use the CTRL+A keyboard shortcut to select all the items in a Windows Explorer window. Or, you cannot select multiple items in a Windows Explorer window by holding the SHIFT key or the CTRL key while you click the items.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2394740.