Windows 7: System Warning and Errors

1) Warning - DNS Client Event

* Name resolution for the name SITEURL timed out after none of the configured DNS servers responded.

*SITEURL -> Everytime, different URL

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2) Warning - nvstor



* Reset to device, \Device\RaidPort0, was issued.

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3) Error - Service Control Manager

* The Computer Browser service depends on the Server service which failed to start because of the following error:
After starting, the service hung in a start-pending state.

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4) Error - Service Control Manager

* The Server service hung on starting.

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Help me to fix those errors
Windows 7 Ultimate 64 bit