http://support.microsoft.com/kb/973904
Let me fix it myself
To unregister the mswrd632 converter yourself, edit the registry as follows:
- Click Start, click Run, type regedit, and then click OK.
- Locate and then click the following registry subkey:
- For 32-bit versions of Windows:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\Text Converters\Import\MSWord6.wpc
- For 64-bit versions of Windows:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Shared Tools\Text Converters\Import\MSWord6.wpc
- On the Edit menu, click Delete.
- Click Yes.
- Exit Registry Editor.
This change will effectively unregister the converter and disable it for third-party applications and for Microsoft Office. Microsoft Office will use its own text converters to open these kinds of files.