KB2463332 SQK Sever 2005 for XP Keeps trying to install but always fails

For the last few days, I keep getting an automatic update attempt of service pack 4 for SQL Server 2005. It consistently fails, and then, the next thing I know, it pops up wanting to install again. This is VERY frustrating. I have looked at some general information that seems to be related to my problem, but, frankly, I am not quite as technically familiar with the details, so I am lost. SQL apparently came as part of a .NET development package that I use very, very rarely. (I have one VB program that I run once or twice a year.)
Any assistance will be appreciated as this is driving me nuts. Although I am somewhat technically inclined, I am not primarily a PC or Windows developer, so I may need somewhat more specific details. (Based on another post, for example, I looked at the registry settings for HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL1/setup but where the person says that MSSQLX is the instance, I have no idea what the instance is. I looked ...