Solved 0x80300021 install error Windows 7 Pro Dual Boot

[wideminnow70]

0x80300021 install error Windows 7 Pro Dual Boot
I have a system with two hard drives for a dual boot system.
I swapped out the two hard drives for larger ones.
I installed Windows 7 Home on the first hard drive and everything worked fine with no problems.
When I went to install Windows 7 Pro on the second hard drive, I keep getting the 0x80300021 error message and I can not install the window 7 Pro OS. The second drive is formatted and checked for errors.
See attachment for disk layout. I am trying to load Windows 7 Pro on Disk 1 7-PRO (P drive)

 

[bigmck]

Why are you installing two Win 7's on your PC? It does not serve any purpose and you are legally supposed to have two Product Keys to do this.

 

[wideminnow70]

I have two separate product keys with 2 separate install disks.
One is for Windows 7 Home and the other is for Windows 7 Professional.
I do a lot of testing on the Windows 7 Home system and when it works properly, I load it on the Windows 7 Pro drive.
Also on the Windows 7 Home disk, I run Windows XP mode that I can not run on Windows 7.

 

[AddRAM]

Why didn`t you unplug Disk 0 before you attempted the install on Disk 1 ?

You`d still have a dual boot and better control over it.

If you swapped out the drives, how did you end up with a recovery partition on Disk 0 ? Did you clone it ?

Where did the Windows 7 Pro installer come from ?

Did you create it, it could be bad, just need to create a new one.

 

[wideminnow70]

The first time I loaded Windows 7 Pro, on 2 separate drives it loaded with no problems without unplugging Disk 0.
The HP Recovery is a copy of the OS that I copied from the original CD for a backup.
The Windows 7 Pro is a OEM disk from Microsoft.
I will try unplugging Disk 0 to see how it works.
Does the Original "C" drive letter change when I plug the Disk 0 drive back in?

Unplugged Drive "0' Worked fine.


Thanks...