Most frequently with HP's is that the huge load of factory crapware and useless OEM utilties throttle and create issues with the OS. For this reason most tech enthusiasts will not even run the factory preinstall but instead Clean Reinstall - Factory OEM Windows 7.
If this is not possible at this time then at the minimum follow these steps to Clean Up Factory Bloatware
If issues still persist then work through these Troubleshooting Steps for Windows 7
starting with the hardware tests.