Playback and editing not working when adding an effect or clip

For some reason, whenever I add an effect or clip to my sequence my premier pro seems to kinda freeze. This never happened before and I was able to use it just fine. I did recently download the newest version of premier pro, so I don't know if my 2013 laptop can handle it. Anyway, when I add an affect my play button doesn't work. I can still click it but it does nothing. Also the when sliding the slider around, the preview is just stuck on the latest image. Cutting a clip and adding a sequence also doesn't work, the only thing that does seem to work though is adding in another clip but that is useless, because I can't preview it anyway and using the tool bar at the very top. This doesn't happen when I do any other task such as cutting and moving about clips only when I add and effect or add a clip into my sequence. Also when I try to exit out of the task, after the problem occurs, Premier saves it and immediatly stops responding.

Sorry for the long post

Be greatly appreciated if anyone had any solutions