Applog 1030 and 1058 Userenv errors after DC upgrade to Server 2003 R2

I upgraded my DC by first running ForestPrep and AdPrep off the second R2 CD, then inserted the CD and upgraded the server.

After restarting, the server took over 10 minutes "preparing network connections" before it finally came back up. And looking at the Application Log I have 1030 Userenv and 1058 Userenv errors every 10 minutes. Can anyone tell me why these are showing up now?
Who is Participating?
The 1030/1058 errors are likely to go away if you open a command prompt and enter
dfsutil /purgemupcache
(requires the Support Tools).
Otherwise, check here for a troubleshooting list:
Applying Group Policy causes Userenv errors and events to occur on your computers that are running Windows Server 2003, Windows XP, or Windows 2000

As for the long boot time, check your DNS settings:
10 DNS Errors That Will Kill Your Network

Frequently Asked Questions About Windows 2000 DNS and Windows Server 2003 DNS

Best practices for DNS client settings in Windows 2000 Server and in Windows Server 2003
dpluspAuthor Commented:
After further research I've determinied that the GPO the 1058 event is referring to is our Default Domain Policy, which has been disabled for some time. Why am I now getting these error messages? They started after the DC upgrade.

dpluspAuthor Commented:
Thanks! I installed the newest support tools and ran dfsutil /purgemupcache and that took care of the error messages.      

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