Boot W7 from External HDD

Okay, so I had an Internal HDD on which I had a W7 already installed. I needed more space on my Laptop, so I replaced my Internal HDD with an External HDD> Now I need the Windows I had on my Internal HDD booted (which is now an External HDD). I changed the options in the BIOS and used Windows Repair as well.
After Windows Repair, the Windows boots up but the boot screen freezes and the computer restarts.
Suggestions?
Answer #1
Why would you want to have the OS on a drive that is not in direct contact with the hardware? If you do this and then remove the HDD your chip-set will not find the OS and your system will fail to boot. Install a product called VMWare or Microsoft Virtual Server, and create a virtual machine on the external hard drive. That way you can load that version of Windows if you want to do that on your main machine, without being concerned for the underlying hardware it runs on.
You can have your main HDD with the OS installed on it and the 2nd hard drive you can use just for storage. You can always buy external HDD’s and they don’t cost a lot of money. I have three external HDD’s (500 GB, 1 TB and 2 TB) that I use only for storage. I even have the 500 GB HDD plugged into my TV so I can use it as a media player for my stored movies.