What partition was active to start with? If you'd changed the active partition the machine would not boot at all - the fact it still boots from the original partition and throws the McAfee pre-boot screen indicates you didn't change the MBR at all.
perhaps you changed Boot.ini ? If so you can boot off an EEPC WinPE/BartPE disk and run WinTech, then you can mount the drive and fix the problem.
There were two partitions that I could see in Windows Disk Management. One was hidden "Restore" Partition and the other one is my OS drive C. Both were not marked active when I looked at it and that's the reason I made the C active. As many have stated in this forum, my company Service Desk is not ready to help other than reimage. They wouldn't escalate my ticket to the encryption support team. All they know is to read the given scripts and ask me to reimage.
The boot option you talked about (EEPC WinPE/BartPE), is this commonly available or do I need to go through my company's Tech team? While I wait for your reply, I'll google it myself and see what I can do. Thanks a lot for your suggestions.
you'll need to go through your companies team - only they have the SDB file with the original MBR that you need.