Microsoft Windows Search Indexer constantly crashes

Hello!
For weeks now, the Search Indexer keeps crashing constantly and it becomes really annoying. Attached is the error message from the event viewer.
Any ideas how to fix this? Outlook performs poorly and constantly hangs since it depends on the indexer...
Thanks
Tobias

Log Name:      Application
Source:        Application Error
Date:          19.11.2007 20:13:52
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Tobias-PC
Description:
Faulting application SearchIndexer.exe, version 6.0.6000.16386, time stamp 0x4549b667, faulting module mssrch.dll, version 6.0.6000.16386, time stamp 0x4549bd4b, exception code 0xc00000fd, fault offset 0x00003f8f, process id 0x1120, application start time 0x01c82ae0523a70e7.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" />
    <EventID Qualifiers="0">1000</EventID>
    <Level>2</Level>
    <Task>100</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2007-11-19T19:13:52.000Z" />
    <EventRecordID>14807</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Tobias-PC</Computer>
    <Security />
  </System>
  <EventData>
    <Data>SearchIndexer.exe</Data>
    <Data>6.0.6000.16386</Data>
    <Data>4549b667</Data>
    <Data>mssrch.dll</Data>
    <Data>6.0.6000.16386</Data>
    <Data>4549bd4b</Data>
    <Data>c00000fd</Data>
    <Data>00003f8f</Data>
    <Data>1120</Data>
    <Data>01c82ae0523a70e7</Data>
  </EventData>
</Event>

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