ACER ASPIRE 6930,DID SYSTEM RESTORE, COM...

DID A SYSTEM RESTORE DURING RESET UP,,CAT STEPPED ON LAPTOP AND IT SHUT DOWN..NOW WHEN IT TRIES TO LOAD IT POPS UP WITH INSTALL WINDOWS ...SAYS UNEXPECTED ERROR, CAN NOT PROCEED. TO INSTALL PRESS OK, RESTART COMPUTER AND RESTART INSTALLATION...DO THAT AND IT GETS TO THE SAME PLACE, AND DOES IT AGAIN...TRIED PUTTING IN DISCS TO REDO RESTORE, BUT IT WILL NOT REBOOT FROM DISC...HOW DO I FIX THIS. JUST GOT COMPUTER IN MARCH, AND HAVE HAD PROBLEMS SINCE...PLEASE HELP ME FIX THIS PROBLEM