Differences between various official Microsoft Windows .iso files

All we need is an easy explanation of the problem, so here it is.

I want to make a bootable USB thumb drive to install Windows on my computer. I don’t want to use my old DVD to create an image and then upgrade to SP1, so I decided to download an untouched .iso file that already has SP1 in it. My question is this, is there a difference between these two files files?

en_windows_7_home_premium_with_sp1_x64_dvd_620851.iso

vs

en_windows_7_home_premium_with_sp1_x64_dvd_u_676549.iso

What does dvd_u mean, is it somehow different from plain dvd? Also will these work with my retail Home Premium key or do these work only for thoe with TechNet/MSDN accounts?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

the u version is more recent according to this site
check this for details

Method 2

U means it is updated with this hotfix, as per reading the link provided by daya

http://support.microsoft.com/kb/2534111

enter image description here

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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