I wouldn't delete them,It is the update hotfixes.
These are listed in add/remove.Open add/remove>check the "show updates" box.
Check this LINK
In my C:\Windows directory, I have a whole bunch of folders that are blue and all have names that are variations of each other. The folder names all start out with $NTUninstall... or $NTServicePackUninstall... Can these be safely deleted? Also, what does it mean when file and folder names are blue in Windows Explorer, as I'm seeing some that are?