I have seen errors of this nature during the install, with these files and also with other files.
I have always simply completed the installation without any problems at all.
All you have to do is look at the files to know if they’re important or not. A changelog, and a readme? Definitely not important files at all, so you can ignore integrity errors.
I had an integrity failure on a .bat file (in the misc/ folder), but since my install was on Linux it didn’t matter, since batch files are Windows-only, so I ignored it.
Now, if you had an integrity error on a .php file, then I would start to get worried. style_emoticons/<#EMO_DIR#>/wink.gif