Hi Amy
- When does your computer overheat? Does it heat up while the normal use or while running any specific application?
- Have you made any significant system changes recently that might have caused this issue?
- When do you get this error “SysClass.dll, Critical Device Controller”? Are you trying to install any USB device?
Please refer the following HP article about Overheating issues.
Troubleshooting an Overheating and Auto Shutdown Issue
If the article above does not address your issue or it does not help I would suggest you to contact HP to get hardware diagnosis done.
Here is the link for HP
http://www8.hp.com/us/en/contact-hp/contact.html
Hope this information is helpful, if you need further assistance on this please write us back we will be glad to assist you further.
Thank you