Event viewer error code

In Event Viewer

DNS Server

Type: Error
Source: DNS
Event ID: 4011
Description: The DNS server was unable to add or write an update of domain name _ldap in zone weboffice.net to the Active Directory. Check that the Active Directory is functioning properly and add or update this domain name using the DNS console. The event data contains the error.

Question: What is the description means and what are the steps needs to be taken so that the message won 't appear again ?

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Directory Service

Type: Error
Source: NTDS General
Event ID: 1094
Description: Disk write caching on drive c: has been disabled to prevent possible data loss during system failures.

Question: What is the description means and what are the steps needs to be taken so that the message won 't appear again ?

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System Log

Type: Error
Source: RSVP
Event ID: 10035
Description: Security policies are propagated with warning. 0x534 : No mapping between account names and security IDs was done. Please look for more details in TroubleShooting section in Security Help.

Question: What is the description means and what are the steps needs to be taken so that the message won 't appear again ?

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Type: Error
Source: Service Control Manager
Event ID: 7000
Description: The Windows Media Unicast Service service failed to start due to the following error:
The service did not start due to a logon failure.

Question: What is the description means and what are the steps needs to be taken so that the message won 't appear again ?


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Application Log

Type: Error
Source: Userenv
Event ID: 1000
Description: Security policies are propagated with warning. 0x534 : No mapping between account names and security IDs was done. Please look for more details in TroubleShooting section in Security Help.

Question: What is the description means and what are the steps needs to be taken so that the message won 't appear again ?

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Type: Error
Source: SceCli
Event ID: 1202
Description: The Group Policy client-side extension Security was passed flags (17) and returned a failure status code of (1332).

Question: What is the description means and what are the steps needs to be taken so that the message won 't appear again ?

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Type: Error
Source: PerfDisk
Event ID: 2001
Description: Unable to read the disk performance information from the system. Disk performance counters must be enabled for at least one physical disk or logical volume in order for these counters to appear. Disk performance counters can be enabled by using the Hardware Device Manager property pages. Status code returned is data DWORD 0.

Question: What is the description means and what are the steps needs to be taken so that the message won 't appear again ?
This error usually resolved by itself about 1 hour later.

Try searching the microsoft support pages and Google for each of your event id's. The microsoft page has help for all of these. Come back if you have more specific questions about some of the errors.
For example http://support.microsoft.com/?kbid=252695 explains your first error

Thank you karsh44