One error is coming with blue screen "Physical memory dumping to disk" for a very short peroid of time and restart autometically. when i start my hp laptop enter the passward and want to do something...
After the safe start uninstall all of the software you installed and see if that fixes the issue -- you may need updated software to install as it may not be fully compatible.
There could be registry corruption in Windows, which would require a repair install or a complete re-installation. If you are using Windows 7 you should be able to repair it, while XP more often required more effort.
In my case, it was VGA first, and then PSU. I think it's tricky to find which one is a real culprit. Even if your VGA is fine, when PSU cannot provide enough power, it can be shut down. In this case, using onboard graphics may alleviate the problem temporarily. I would try a new PSU. If this solves the problem, stick with it. If the issue persists, then get a new graphics card.
His problem is his hp laptop, more likely software than hardware.
In the last few hundred desktops I've repaired for hardware the most common issues I saw were (1) memory, (2) psu, (3) hdd, (4) video; but far more were driver problems or incompatible software than all hardware combined.