Slipstream SP3 - .NET Framework 3 No Longer an Optional Update

[cardude]

I slipstreamed XP Service Pack 3 into my Windows XP installation CD. I then installed Windows using it and everything went well. I then went to update my computer, and only .NET Framework v1.1 and v2 showed up in my optional updates. .NET Framework v3 was nowhere to be seen, in both the custom and express update options. I checked Add/Remove Programs with the "Show Updates" option enabled, and .NET Framework v3 wasn't there either.

What has happened to .NET Framework v3? How come it no longer shows up in the Windows/Microsoft Updates after SP3 is installed? Has anybody else experienced this problem?