How to Repair your Windows 7 Installation if it won't Boot (Official Dell Tech Support)

Learn how to use the Windows System Restore feature to repair software issues from outside of the operating system. A Windows System Restore returns your computer to a previous time, removing recent changes to the software on your computer without destroying new files you may have saved or created.

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Here are some links to help you get Window,Drivers and Installed Software Installed.
Manually Installing Windows 7
http://www.dell.com/support/contents/us/en/19/article/Product-Support/Self-support-Knowledgebase/windows-7-support?c=us&l=en&s=dhs&cs=19

Drivers
http://www.dell.com/support/home/us/en/19?c=us&l=en&s=dhs

Installed Software
http://www.dell.com/support/contents/us/en/19/article/Product-Support/Self-support-Knowledgebase/app-software?c=us&l=en&s=dhs&cs=19

Other Installed Software
https://smartsource.dell.com/Web/Welcome.aspx?ReturnUrl=%2fweb%2fmain.aspx

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how to repair windows 7