OS Problem

I have a new PC - Gigabyte motherboard, Quad Core i5 CPU, 4 hard disks etc.

I have disconnected 3 hard disks to minimize any problems and left only one HDD. After started installing Win 7 Pro, I noticed that the mouse is not working. Very odd.

After installation my dual monitors did not work only one, the screen resolution only 800x640 and all peripherals like internet, USB ports all disabled. This is very odd as I thought that with Win 7 OS all peripherals will work normally as with my last PC.

I inserted the Gigabyte motherboard DVD disc to start installing drivers but since my mouse is not working I cannot install the drivers.

Now I am stuck - purchased this system for $1600 and is useless.

When the outlet sold me this system, the OS seemed to be installed on all 4 Hard Disks - when I disconnected one hard disk, Windows did not work only the Windows Boot Manager came to screen.

I do not wish to go back to the outlet because they already told me to leave the PC at their offices and try to fix this but need the PC for I have back log of work to do. If I go to the  outlet it would be difficult to suppress my anger and probably I would stuck this PC inside a head of one of the staff. But in the end if EE will not help me in this matter then I have no other option but to return the PC back to the outlet which is famous in UK and in my home country of Malta.

Please help. Thanks.