Perhaps you need to upgrade to W10. From what I am gathering, those who do upgrade are generally OK but there are glitches, however new upgrades appear to be pushing people into upgrading to W10. My daughter has also lost Word, in fact the whole Office suite software and no tricks in the world seem to get round it. Fortunately as a student she is entitled to Office free but school only started today so she has not got the college's email yet. When she lost Skype, some of the embedded files appeared to have been 'changed' into another format. The difference is that she had recently upgraded to W10 and you are still on W7. Anyway, when she uninstalled all Skype files and loaded again from scratch what she got is different to what I have and, if anything, a little better.
Perhaps that is your solution.