Font and size keep changing on my Word documents

Ever since I Purchased an HP Pavilion Laptop with Windows 8 64 bit my Word documents fonts are all messed up. The size doesn't stay true to what is set. I can set it at 10 using any of the font styles, usualyy Airel, and it comes up really small or huge. Then I click on the large or small A's at the top and go into set a default but it never stays that way though I have saved it. At one point a technician got on remotely and set it but then when IE started acting up and then everything else became unstable I did a full recovery and lost the settings. I can't get it straightend out. I am so tired of struggling with this crazy system.  I wish I could post on here and get answers but lately I haven't been getting any answers. They used to be pretty good about quick responses on here. I can only think there are so many problems with this system that no one can keep up with addressing the problems!