I built a designer a new cad/cam machine with an ssd. Windows 7 installed like normal. Sounds like his BIOS settings are off a bit.
Googled some info on it.
1.Boot up Windows 7 disc.
2.When the welcome screen comes up on Windows Setup, press Shift + F10, which will display a command prompt.
3.Type "diskpart" (no quotes) and press enter.
4.Type "list disk" and press enter.
5.Hopefully you can see your SSD in the list. You should see a number identifying it. Now type "select disk X" (where X is the number identifying your SSD) and press enter.
6.Type "clean" and press enter. This will write a blank MBR, YOU WILL LOSE ANY DATA ON THE SSD if you did have anything on it.
On a side note dont buy a new cheap machine and think you can downgrade from 8.1 to 7. I picked up an ACER for my front counter and the bios is so locked down it will only run 8.1. I messed with it for 2 days and finally gave up.