Should fix the issue for you.
I have edited these same files in these same locations on this same machine dozens of times without a problem before. This is something new that starting just this morning. System restore didn't help.
This is a Win7 HP PC and I'm the Owner/Administrator.
Any sub folder of the C:\Program Files parent folder.
In Googling this, many people have said these files are protected by default, but I had no problem making modifications to them before this morning.
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