How can I edit Windows protected system internal files in VMWARE? On a normal PC, I can simply reboot the PC and use a different Operating System to prevent the 'access denied' error... But how do I edit those protected files when inside VMWARE?
You can easily map or mount VMWare virtual disk to the host system and access needed files. To quote VMWare Workstation 9 Documentation Center:
When you map a virtual disk and its associated volume to a drive on the host system, you can connect to the virtual disk without opening a virtual machine. After you map the virtual disk to a drive on the host system, you cannot power on any virtual machine that uses the disk until you disconnect the disk from the host system.
The menu is accessed by:
Windows host: Select File > Map Virtual Disks.
Linux host: Select File > Mount Virtual Disks.
You could also use another operating system, for example boot from a Linux LiveCD and make the changes you want. VMware allows you to use an ISO file directly for the dvd drive, you can do that by going in the hardware settings of your VM, selecting the CD/DVD drive and then selecting the ISO image. Your VM should then boot on the Livecd and you can now do your changes as you normally would.