How to changed my boot settings back in msconfig?

Now i keep getting blue screen error messages. I know what the problem is I just can't get to where I can fix it. Before my last restart I changed my boot cpu's from 1 to 8. Now i can't get back in to change it back. Safe mode gets error messages to. I can get to the comand prompt but for the love of god I can't get msconfig to load. If i can get msconfig to work i'm golden.
If it helps the laptop is a lenovo w510 with an i7 720

You did not give a response to the first answerer whether or not system
restore rectified the problem.

If still a problem contact Lenovo Tech Support: http://www.justanswer.com/sip/Lenovo/computer?r=ppc|ms|4|Tech%20%28M%29%20-%20Computer%20-%20Top%20Brands%20-%20Search|Lenovo&JPRC=1&JPKD=30480427607&JPDC=p&JPAD=3787232783&JPKW=contact%20lenovo&JPRQ=contact%20lenovo%20support&JPAF=txt&JPCD=20140124&mkwid=tHrcaOV3&pcrid=3787232783&pkw=contact%20lenovo&pmt=bp&r=aw|271445|0&awc=7742_1514656502_64aeb43105f667c248f0c7b3b510d36f

Contact Microsoft Support: http://support.microsoft.com/.../?ln=en-us

You may need an Outlook account for the Microsoft Support site to help
with the problem.

Last resort option: Reset the computer to it's default factory settings.
Back up all important data before going with this option.

Use "system restore" to take back your system to an older date when your pc was working correctly