The problem with HP is that it comes loaded with sponsored bloatware and duplicate utilties that have much better versions built into Windows 7. This crapware throttles and corrupts Windows 7 from it's native instantaneous state.
For this reason many tech enthusiasts chooose to Clean Reinstall - Factory OEM Windows 7.
Everything needed is in the blue link, including steps to get and keep a perfect install.
At the minimum I would Clean Up Factory Bloatware
In addition here are steps to Optimize Windows 7 - Windows 7 Forums
After working through these steps if problems persist then work through these Troubleshooting Steps for Windows 7