hi there... i am in the process of trying to repair my system.... files associated with windows update are missing.... poss. tune up utilities 2012 messed my system up...  i have downloaded the windows downloader tool, and have the sp1 iso file burnt to disc.... now when i put my disc in , ( i did alter my BIOS so it would check the disc )  i click on repair my computer and NOT  install ..... what next ???

Download the corresponding edition of Windows 7 with SP1 integrated that you have a license for:

• Windows 7 Home Premium (x86) - 32 bit

• Windows 7 Home Premium (x64) - 64 bit

• Windows 7 Professional (x86) - 32 bit

• Windows 7 Professional (x64) - 64 bit

• Windows 7 Ultimate (x86)* - 32 bit

• Windows 7 Ultimate (x64)* - 64 bit

32 vs 64 bit

http://windows.microsoft.com/en-US/windows7/32-bit-and-64-bit-Windows-frequently-asked-questions

Is my PC running the 32-bit or 64-bit version of Windows?

http://windows.microsoft.com/en-us/windows7/find-out-32-or-64-bit

http://windows.microsoft.com/en-US/windows7/Installing-and-reinstalling-Windows-7

ImgBurn - In addtion to supporting the creation of CD's from .ISO files,
it supports a wide range of other image file formats, and it's free.
(BIN, CUE, DI, DVD, GI, IMG, MDS, NRG, PDI and ISO)
http://www.imgburn.com/

http://neosmart.net/wiki/display/G/Burning+ISO+Images+with+ImgBurn

Note: Always use the slowest burn speed (4x or 2x) if offered a choice.

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Then attempt a repair upgrade: