Hello goohole,
Can you manage to get to your account at all before your PC freezes? Or does it freeze before that? What is your OS? Windows 7 or 8?
If you can get to your account, there are a few options to try.
You could use the Last Good Known Configuration. It will return many important settings to the states they were in the last time Windows started successfully, hopefully solving this problem.
You could load into Safe mode and use System restore. Windows could freeze, stop, or reboot during the startup process because of damage to a driver, important file, or part of the registry. System Restore will return all of those things to their last working order.
You could try to make an automatic repair. In Windows 8 this is found in the Advanced Startup Options menu. You could also try and boot from the Windows 8 Installation media:
1. Insert the Windows 8 disk or flash drive and boot
2. From the Windows Setup screen, click on Next
3. Click on Repair your computer
You could also do a Refresh Your PC (again for Windows 8). This enables you to get Windows 8 to reinstall itself onto your computer. And while installing a fresh copy of itself, Windows 8 saves your user account, your personal files, your apps downloaded from the Windows Store, and some of your most important settings.
1. Open the Charms bar and click Settings
2. Click Change PC Settings to open the PC Settings screen
3. Click General from the PC Settings screen’s left edge
4. Scroll down the right side of the PC Settings screen’s General section. Under Refresh Your PC Without Affecting Your Files, click the Get Started button
5. Click Next
6. If asked, insert your Windows 8 disc, flash drive, or whatever else you used to first install Windows (you can’t use the Refresh option without this Windows 8 disk/flash drive)
7. Click the Refresh button
Windows 8 refreshes your computer, using any files it needs from the disc or drive you inserted in the previous step. It may restart a few times during the process, which usually takes less than a half hour.
If you have Windows 7 you'll need to boot from the DVD again.
1. Follow the instructions
2. Click on Repair your computer. This will begin the Windows 7 System Recovery Options
3. Follow instructions further
Note: these processes are for repairing Windows, you don't need to click on Install, as you already have OS installed. Remember to remove any external hard drives so that the repair would work properly.
You could also clear the CMOS. This is the BIOS memory on your motherboard and it will return the factory settings. A BIOS misconfiguration could also be a reason for freezing. If needed, replace the whole CMOS battery.
Lastly, you could try and reseat your PC parts once you turn off your PC and disconnect it from the power.
If nothing works, I hope you can find some answers on this support page of Microsoft:
http://support2.microsoft.com/kb/2681286/en-us
I hope any of this will help you!
Best of luck!
CK_WD