The file could be in use by the os. Right click on the file and make sure the run as administrator is checked.

As a secondary option boot into safe mode. Press F8 at the Dell splash screen and try it there

HI Anim8tor, Found this HERE, it may be of intrest to you, if you like using 3rd party software.

Thanks Dave.  I'll give that a go.

Anim8or

Thank you Robin.  Just for you to know I dowloaded and paid for RegCure and it did not work.  Have requested a refund on it.

Animator.