Windows 7: Repair Install

Can I do a repair install by booting up my system to my installation disc rather then opening it inside of Windows? Because I can't open my installation disc in Windows because my system is pretty messed up right now.

Welcome

This is the way to do a repair install

Repair Install[2]=General Tips

System Recovery Options

That way is done by logging in to Windows, can I do it by making my system boot up to the installation disc by choosing it in the boot menu?

I gave you our official Tutorial on Repair Install. This article will answer your question.
Windows 7 Startup Repair - How to Perform a Startup Repair in Windows 7

Let us know if Startup Repair works. Sometimes you have to run it more than once.

If not, there are other approaches to get it started, as well as methods to rescue any data you need.

I'm having a problem bigger than that, check it out here I Think I May Have A Worm or Virus

Based on your previous thread, I would backup your data and perform a clean install..

If you think you are infected, be sure to wipe the HD before clean install.

Use free Partition Wizard bootable CD or boot the Windows 7 DVD Repair Console or Repair CD, press Shift F10 at bootup or click through to Recovery Tools list to open a Command Line, type:

DISKPART
LIST DISK
SELECT DISK # (for Windows 7 disk)
clean all (applies zeros, deepest clean, takes about an hour per 320gb)
create partition primary
select partition 1
assign letter=c:
active
format
exit

Now whenever I start up my windows right before it gets to the login screen it gets a blue screen of death.

Don't try to start it, just boot into PW or the Windows 7 DVD/CD to clean the HD and reinstall.

Do you have data you need to retrieve from the HD, even though it may be infected?
Use this if so: http://www.techspot.com/vb/topic129757.html

If you want to try to rescue your install, it may be possible to install and run Avast boot scan and MS Security Essentials from the rescue disk OS.

Be sure to scan any data imported immediately using MS Security Essentials, which should be installed first after clean reinstall. Then scan it with Malwarebytes and Spybot to be sure. Finally scan the rescue disk and any Windows 7 Repair CD or Install DVD you use.