+1 for problems after update. I know its a known problem but I'll throw in my 2 cents for thoroughness. D/L'd and installed 5.2, first start up got the EA/crysis screens, closed program and ran repair build through the launcher. Repair replace a bunch of files, restarted game. Wandering Samurai screens loaded, when it got to the first menu screen it showed the "modified files" error. Again went to repair build, info.xml and bin32\v_credist_x64_2005_KB2538242.exe came up. Restarted game, and same "modified file" error comes up.
System:
Dell on 32bit XP home, 2.4ghz core 2, dell L100 keyboard, 4gb ddr2, 9800GT,pink "hello kitty" stickers, 620w Antec PSU, Mouse pad with Japanese character for "Love", Dell 22" LCD monitor, GE dual scroll mouse, and a partridge in a pear tree.