I have to agree, the problem with repair as it tends to replace every file, but your system is still aware of all applications, so internal drivers for some software may not be up to date, or worse overlapping other drivers. The repair install should normally be avaoided for anything other than a bootloader problem or similar, even then you do not install, simply use the repair console.
I would suggest a clean install as well, there is a tutorial on this site for doing this if you have some files/data you do not wish to lose.
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