Hello,
I have a Acer 4330 windows 7 froze so i reboot that didn't work so i replace hard drive,memory,could it be the motherboard or processor I can load windows files but freezes at windows?
Have you tired safe mode? How much memory do you have? More complete system specs would be helpful.
If you replaced the hard drive, do you have the drivers for your notebook?
If it is still under warranty its better to send it in. Otherwise, it sounds like an overheating issue to me if you can replace the thermal paste with a good one then i think that will solve your problem. If you're able to fix it let me know. ^^