Computer won't open programs after OS error

I just bought a Sony Vaio on the 11th. Today after I restarted my net modem I came back to my computer saying it could not access the os. after restarting the computer it ran a system start up repair. Now my computer will not open my firefox, and takes a good while to open anything that doesn't open on start up. I attempted to do a system reset but nothing has changed. The only time that I can move my mouse without it freezing is in safe mode. Please help <3
 
It should still be under warranty. Is there any reason you cannot take it back to the seller for repair?
 
I have to agree with mailpup here, take it back to where you purchased it from.
 
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