Win7 instead, because there is no need to learn Win8 from office perspective. Also Win7 comes with awesome system image backup. Win8 also has it, but, if you are not familiar with Windows7, the additional extra 4 more choices will confuse you, and none of them actual do true image backup, unless you go deeper to find the seemly hidden Win7 Image backup.
You also get the same problem on other apps on Win8 because there are several duplicated apps on Win8, which is confusing and downright annoying. And it will try to open photo on slower version when it is incapable to see the next photo in the same folder. No need to bother with those things until they fix this replication mess in the future.