Dual boot Windows 7

Howdy

My friend recently bought a powerful gaming PC. I don't know the specs apart from It has a 250G flash drive as a primary and a 2TB as a secondary drive and 12Gig of ram. The trouble he has is that the primary isn't big enough for all of the games he has.

So the machine came with a OEM windows 7 pr-installed and the supplier threw in a Windows 7 Home premium box and disk with it. Both Windows 7's with different serial numbers.

What my friend tried to do was install the windows home premium onto the TB drive. One of the problems he is now having is the mouse doesn't work on the TB Win 7 drive. We tried a different mouse. Same problem, it worked on the primary drive but not the TB instal. Also the windows desktop is not stretched to the full size of the monitor on the TB install. I told him he should have partitioned the drive first and had a windows partition.

I think he also changed something in the BIOS to make it install??

Can this setup he has work and if so what could he have done wrong?

Thanks

My friend recently bought a powerful gaming PC.

I think he also changed something in the BIOS to make it install??

As the new MOBO's now have a UEFI/BIOS firmware.
How to install Windows 64 bit on a UEFI/BIOS firmware:
UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with
or
UEFI (Unified Extensible Firmware Interface) - Install Windows 8 with


For more info on UEFI:
Windows and GPT FAQ
Unified Extensible Firmware Interface - Wikipedia, the free encyclopedia
UEFI Firmware
Technical Note: UEFI BIOS vs. Legacy BIOS, Advantech(EN) - YouTube
Sample: Configure UEFI/GPT-Based Hard Drive Partitions by Using Windows PE and DiskPart

Can this setup he has work and if so what could he have done wrong?

most likely missing driver software.

Follow these same steps to get and keep a perfect Clean Reinstall - Factory OEM Windows 7.

Check in BIOS setup to see if you have Legacy or UEFI settings. If UEFI you'll either need to enable Legacy or Compatibility Mode to install normallly, or boot to the UEFI choice for your Win7 media, delete all partitions during install to change the disk formatting to GPT for UEFI install.

Either way, unplug all other HD's during install. I would install to the SSD for best performance. Put your network LAN driver in the backup to get online quickly if the installer doesn't provide it for you, then enable Automatically deliver drivers via Windows Update (Step 3) and run all rounds of Important and Optional Updates, with reboots, until there are no more. This should provide most drivers. Any still missing afterwards can be imported from the Device's Support Downloads webpage. We can help you with this.