Updating to sp3 downdating definition
Conclusion: It does pretty much what is said on the tin and in our own humble experience, download and installation was pretty simple.
I thought I was Administrator, but in reality you probably aren't.
Something happened that removed that level of permission from a branch of the Registry required to be writable in order to upgrade the service pack level.
Another cause of this access denied failure is if the account you are logged onto is anything less than an administrator level account.
Windows XP Service Pack 3 (SP3) includes all previously released updates for the operating system.
SP3 contains significant security enhancements, in addition to stability and performance improvements.The most frustrating part of the issue is that it happens 30 minutes into the process, which you have to completely re-start in order to try again. You can reference these instructions in detail at Microsofts Knowledge Base here: How to Install Windows XP SP3 Service Pack 3 and avoid Access Denied errors 1) Download the Service Pack Installation file here: