The HP freezinng issue can be caused by many many reasons such as outdated hardware, overload startup programs, corrupt registry issues, too many junks, virus attack, poor security software taking too much system resources, remnants of uninstalled applications etc. The fact is, you should keep some system maintenance job regularly. If you don't want to do these manually, try
http://www.speeduphp.com/hp-laptop-freezes.html to give a free & full scan of your slow HP PC to find & fix all possible issues.
Meanwhile, upgrading hardware configuration (add RAM, change a new video card, larger-volume HDD etc) can be a fast yet effective way to improve your pc performance. But that won't be the most economical way, as you know you can't always afford to do that.
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