No this is not a common problem with Windows 7.
Looks like you need to use the program
Unlocker. This program works for both x86 and x64 platforms.
Download and install the program. This will add an entry "Unlocker" to your right click context menu.
Whenever you face a problem mentioned above, on the target file right click and choose "Unlocker". This will show any program / process currently accessing the file. It also gives you an option to kill that program / process so that you can go ahead and do whatever you wish to accomplish.