Thank you for your post.
Based on your reported error, please try resetting SDL Trados Studio to default state.
Therefore, please check the following :
1. Make sure that all 2014 components are closed.
2. Browse here:
C:\Users\[User_Name]\AppData\Local\SDL: rename the SDL Trados Studio and ProjectApi folder
C:\Users\[User_Name]\AppData\Roaming\SDL: rename the SDL Trados Studio folder and ProjectApi folder if there is one.
C:\Users\[User_Name]\Documents\Studio [VERSION]: rename the Studio [VERSION folder to Studio [VERSION]_Old
3. If you do not see folders such as "AppData" please check if you have hidden folders on.
4. After performing step 3. check if SDL Trados Studio opens.