It's impossible to say with any certainty.
But if the unit is old the most likely thing is that when you attempt to Apply SP2 and it doesn't load or finish there is Incompatible Hardware.
M$ has removed the Compliance Tester for SP2 so you have to look at your hardware. The first things to look at are Optical Drives, when SP2 first came out M$ advised that quite a few CD Burners where not compatible with SP2 but as more and more people started to install SP2 it became obvious that it wasn't just CD Burners but all Optical Drives more than 6 months old could have issues.
I spent a week once attempting to install SP2 onto a P4 and every time the Partition Tables on the Boot drive where wiped away so after the install there was nothing left to boot from.
In that particular case it was a Samsung DVD ROM drive causing the problems. Generally speaking Intel Chip Set M'Boards of the 440 BX or newer don't have a problem but some of the other Chip Set M'Boards could have issues with SP2. Other things to look at besides Optical Drives of all types are some scanners and drivers. If you have new or at least relatively new Hardware look at updating the drivers to the newest available and try again to install SP2.
Just a word of warning here It's safer to have a Clone of the HDD so that if SP2 damages the Boot Disc you can reimage the Boot Drive in a few minutes and not waste hours wiping the HDD and reinstalling Windows.
It would have helped no end if you had of said if SP2 was previously installed. If it was you need to look at what has changed and see what can be altered. Drivers are always a good starting point if it was working previously.
If you where not using a SATA Drive Previously try grabbing the newest Drivers for your Hardware.
Col
