Terminal server is getting hang

Team,

I am facing some issues in my terminal server.

Its suddenly getting hang then i have to hard-reboot the server.

I have gone through the event viewer and got one error.

here is the error

Log Name:      System
Source:        Microsoft-Windows-Kernel-General
Date:          5/25/2011 4:17:11 PM
Event ID:      6
Task Category: None
Level:         Error
Keywords:     
User:          SYSTEM
Computer:      test.Tally.Tallysolutions.com
Description:
An I/O operation initiated by the Registry failed unrecoverably.The Registry could not flush hive (file): '\??\D:\Documents and Settings\rajani.b\AppData\Local\Microsoft\Windows\UsrClass.dat'.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Kernel-General" Guid="{a68ca8b7-004f-d7b6-a698-07e2de0f1f5d}" />
    <EventID>6</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2011-05-25T10:47:11.488Z" />
    <EventRecordID>24753</EventRecordID>
    <Correlation />
    <Execution ProcessID="1012" ThreadID="50384" />
    <Channel>System</Channel>
    <Computer></Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="FinalStatus">0xc000014d</Data>
    <Data Name="ExtraStringLength">83</Data>
    <Data Name="ExtraString">\??\D:\Documents and Settings\rajani.b\AppData\Local\Microsoft\Windows\UsrClass.dat</Data>
  </EventData>
</Event>

any one can help me on this ????