Hello! I recently upgraded my 32bit Vista Business SP1 to SP2, and after this Registry Cleaner in most aggressive mode marked these keys as invalid:
Data fields are: Key, Entry's name, Value, Entry last modified, Error severity, Error description
HKCR\CLSID\{1C5221CB-C1F6-4999-8936-501C2023E4CD}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBth.dll
HKCR\CLSID\{1C5221CB-C1F6-4999-8936-501C2023E4CD}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBth.dll
HKLM\Software\classes\CLSID\{1C5221CB-C1F6-4999-8936-501C2023E4CD}\, @, Bluetooth FD Provider, 23.07.2009, 23, 55, C:\Windows\System32\fdBth.dll
HKLM\Software\classes\CLSID\{1C5221CB-C1F6-4999-8936-501C2023E4CD}\, AppID, {1C5221CB-C1F6-4999-8936-501C2023E4CD}, 23.07.2009, 23, 55, C:\Windows\System32\fdBth.dll
HKLM\Software\classes\CLSID\{1C5221CB-C1F6-4999-8936-501C2023E4CD}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBth.dll
HKLM\Software\classes\CLSID\{1C5221CB-C1F6-4999-8936-501C2023E4CD}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBth.dll
HKCR\CLSID\{C5599E1B-FC7B-4883-9FF4-581BBAEF8DBA}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBthProxy.dll
HKCR\CLSID\{C5599E1B-FC7B-4883-9FF4-581BBAEF8DBA}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBthProxy.dll
HKLM\Software\classes\CLSID\{C5599E1B-FC7B-4883-9FF4-581BBAEF8DBA}\, @, Bluetooth FD Provider Proxy, 23.07.2009, 23, 55, C:\Windows\System32\fdBthProxy.dll
HKLM\Software\classes\CLSID\{C5599E1B-FC7B-4883-9FF4-581BBAEF8DBA}\, AppID, {1C5221CB-C1F6-4999-8936-501C2023E4CD}, 23.07.2009, 23, 55, C:\Windows\System32\fdBthProxy.dll
HKLM\Software\classes\CLSID\{C5599E1B-FC7B-4883-9FF4-581BBAEF8DBA}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBthProxy.dll
HKLM\Software\classes\CLSID\{C5599E1B-FC7B-4883-9FF4-581BBAEF8DBA}\, {KEY}, {KEY}, 23.07.2009, 23, 55, C:\Windows\System32\fdBthProxy.dll
HKCR\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKCR\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKCR\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\, @, IDevicePairingConfiguration, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\NumMethods\, @, 5, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dba}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKCR\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKCR\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKCR\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\, @, IDevicePairingConfiguration, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\NumMethods\, @, 4, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
HKLM\Software\classes\Interface\{c5599e1b-fc7b-4883-9ff4-581bbaef8dbb}\, {KEY}, {KEY}, 23.07.2009, 23, 55, Invalid ActiveX/DDE/COM/DCOM/OLE item
It has to be something from Vista's SP2 new Bluetooth manager.
After fixing those entries my PC can not detect any BT device in range. Files C:\Windows\System32\fdBth.dll and C:\Windows\System32\fdBthProxy.dll are present in system. So, I guess, it's misdetection?
And, God bless Backup function! :) After restoring BT functioning good again.
Regards!