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I recommend backing up your registry (at least the keys being edited) before making any changes. Here is a link to Microsoft's KB article on backing up the registry:<br />
http://support.microsoft.com/kb/322756/

===== Microsoft Windows Vista =====
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  - Click**Start**, and then click**All Programs**.
  - Click**Accessories**, and then click**Run**.
  - Type regedit, and then click**OK**. If you are prompted for an administrator password or for a confirmation, type the password, or click**Allow**.
  - In the navigation pane, locate and then click the following registry subkey:<div class''"indent">HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}</div>
  - In the right pane, click**UpperFilters**. <br /><br />**Note** You may also see an UpperFilters.bak registry entry. You do not have to remove that entry. Click**UpperFilters** only. If you do not see the UpperFilters registry entry, you still might have to remove the LowerFilters registry entry. To do this, go to step 8.
  - On the**Edit** menu, click**Delete**.
  - When you are prompted to confirm the deletion, click**Yes**.
  - In the right pane, click**LowerFilters**.<br /><br />**Note** If you do not see the LowerFilters registry entry, unfortunately this content cannot help you any further.<br />
  - On the**Edit** menu, click**Delete**.
  - When you are prompted to confirm the deletion, click**Yes**.
  - Exit Registry Editor.
  - Restart the computer.
===== Microsoft Windows XP =====
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  - Click**Start**, and then click**Run**.
  - In the**Open** box, type regedit, and then click**OK**.
  - In the navigation pane, locate and then click the following registry subkey:<div class''"indent">HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}</div>
  - In the right pane, click**UpperFilters**. <br /><br />**Note** You may also see an UpperFilters.bak registry entry. You do not have to remove that entry. Click**UpperFilters** only. If you do not see the UpperFilters registry entry, you still might have to remove the LowerFilters registry entry. To do this, go to step 7.
  - On the**Edit** menu, click**Delete**.
  - When you are prompted to confirm the deletion, click**Yes**.
  - In the right pane, click**LowerFilters**. <br /><br />**Note**  If you do not see the LowerFilters registry entry, unfortunately this content cannot help you any further.<br />
  - On the**Edit** menu, click**Delete**.
  - When you are prompted to confirm the deletion, click**Yes**.
  - Exit Registry Editor.
  - Restart the computer.

-- FredPettis - 21 Apr 2009