Hi Deeth :
Several PRECAUTIONS should be done PRIOR to upGRADING ( from SP2 to SP3, for
example ) an Operating System. which I feel should include the following :
1) Get the latest RELIABLE Info on possible problems; I trust the FREE "Windows Secrets"
& "Don't let XP3 hose your system" from
http://WindowsSecrets.com/080911 is very good .
2) Make reasonable sure the computer is Malware-free ; practically speaking, nowadays
that means running the "Full Scan" of the FREE Ver of "SUPERAntiSpyware" from
http://www.superantispyware.com/ AND the "Free" Version of "Malwarebytes' Anti-Malware
from
http://www.malwarebytes.org/mbam.php .
3) Get the latest PC Manufacturer "Driver" updates , IF there are any .
4) Make a "System Restore" Point, to go back to, IF the Installation is NOT successful .
Refer to the excellent Guide at
http://www.bleepingcomputer.com/tutorials/tutorial56.html