WHEN BOOTING UP THE SYSTEM JUST HANGS AND DOES NOT ADVANCE INTO WINDOWS

check the indicators on the right side of the front panel for more detail of the error. search online for the manual.

I think at this point, you should consider using your recovery disc if you have one before the system freezes up.

go here http://www.supportdock.com/

Try booting into safe mode. If it's a driver problem, safe mode will allow you to start Windows with only the bare minimum of hardware and drivers being engaged. To get to safe mode, press the F8 button on your keyboard during the Windows boot process until it takes you to a screen to let you select Normal, Safe Mode, Safe Mode with networking, etc. I would suggest not using anything other than just Safe Mode. From there, uninstall any software or new drivers that you recently installed. Alternatively, you can use the System Restore feature to rollback to a previous restore point.

Apparently you solved your problem and the system no longer hangs, though you never supplied the information requested.

This is happening to me press F8 for advance setting try one of the 12 options it should work on a VAIO laptop or contact Sony

This means that the operating systems was not installed properly...."Boot manager is failed... and ntldr is the main file... which help computer to boot up..." try reinstalling the operating system again...

During your boot screen press the F8 key to boot into safe mode. If that gets you to the desktop run virus/spyware scans. Reply with any results.

A computer hanging when it has boot could possibly be associated with: -
1. Processor Overheating
2. Corrupt Operating System.
3. Corrupt RAM

Recommendation.
On the first instance, when the computer is booting, if you can switch to the BIOS setup and check the system health, you could find that the temperature could be more than 60 degrees celcius.
To solv this, ensure that the cooling fan is sitted properly on the processor.
Ensure there is no dust on the fan as this could slow down the rpm(revolutions per minute) or try changing another fan.

As for the operating system, you can trying loading or repairing the existing operating system using the right source.

In some cases where RAM is corrupt, trying using another chip to be sure if the problem is being caused by this.

Good luck.

use the windows cd to perform a repair installation if you get startup errors or the system wont start.