Red Hat / Fedora :: Dual Booting SL6.1 And Windows - After Editing The Grub.config To Include Windows

i am having some issues with dual booting my SL6.1 and Windows. The situation is that i recently acquired an old hard drive from a non-working computer of mine with Windows already installed (i know the windows is functional, as i tested it on my new PC with SL6.1 currently installed & everything runs fine)

The problem is that after editing the grub.config to include windows, windows will no longer boot after an attempt to install a legit version of McAffee anti-virus software which coincidently was only after the first attempt at running both OS's in a dual-boot fashion. Except past the windows start up screen before the dreaded blue-screen.
Which is weird because SL6.1 OS will still boot & works perfectly fine like always, so it doesn't really make sense.

My current setup is:
Disk 1: Solid-State:
Boot Partition
SL6 LVM1: Root Partition
Disk 2: Hard Drive:
SL6 LVM2: User, Temp & Swap Space Partitions (Different LVM to Root)
Disk 3: Hard Drive:
Windows 7 Professional 64-bit

My guess is its windows MBR. The reason i say this is because the Hard Drive contents of the Windows software still appears intact when accessing the drive from the Linux OS. I don't won't to go through the rigmarole of re-installing both OS's. So hopefully their is a relatively simple solution.