How to factory reset computer?

So, I have a dell laptop that was running Windows Vista Home Premium. I started installing Windows 7 Professional. However, it was hanging on "Completing Installation", and I read somewhere to hard reset it.

Huge mistake. Now it will not boot at all. The setup manager keeps saying it needs to restart, and all I can press is "OK". And there is no repair option under the boot menu. Whenever I try to boot from the usb, I just get a black screen with a cursor. I can, however, access the command prompt.

My Question:

How can I get my computer to at least be able to boot up again so I can restart the installation?

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