Dell Inspiron N5050 Laptop Unresponsive - Windows 7 Could Not Start Successfully

I bought my Dell Inspiron N5050 laptop, windows 7, intel i3 core processor about 3 weeks ago, and it ran perfectly, handled all my ridiculous multitasking well, and was really light compared to others I've had. This morning my nephew was using it to play Skyrim (I digress, sometimes I sneak onto his game files for a little fun) and....well he has some anger issues, but that's not what this is about. Something upset him and he slammed the lower left side of the laptop pretty dern hard. Nothing broke on the outside, but suddenly the computer became unresponsive, and I had to force shut down the whole thing. When it started back up it wouldn't....start back up. I got an error message saying "Windows could not start successfully, we recommend you launch startup repair to try and fix the problem. Well I did that about 2 dozen times in a row with failures each time, till finally, much to my joy, it successfully started back up. Except now whenever I try to open a new program, it sometimes has periods of unresponsiveness, and some things like Skyrim can't be opened at all.