I'm was having some problems with these controls so I uninstalled and tried to reinstall. Now getting this install error: Could not write value to key \Mere Mortals Infragistics Web Controls for VS 2005. Verify that you have sufficient access to that key ...
It looks like it's trying to write to HKLM\Mere Mortals Infragistics Web Controls for VS 2005 ? regmon shows:
908.39501953 msiexec.exe:1668 CreateKey HKLM\Mere Mortals Framework Infragistics Web Controls 2005 for VS 2005 INVALID PARAMETER
Below is the install log area in question. Thanks

MSI (s) (84:70) [17:04:05:499]: Executing op: RegOpenKey(Root=-1,Key=Mere Mortals Framework Infragistics Web Controls 2005 for VS 2005,,BinaryType=0)
MSI (s) (84:70) [17:04:05:499]: Executing op: RegAddValue(,,)
MSI (s) (84:70) [17:04:05:499]: Note: 1: 1401 2: HKEY_LOCAL_MACHINE\Mere Mortals Framework Infragistics Web Controls 2005 for VS 2005 3: 87
MSI (s) (84:70) [17:04:05:499]: Note: 1: 2262 2: Error 3: -2147287038
MSI (c) (CC:84) [17:04:05:499]: Note: 1: 2262 2: Error 3: -2147287038
DEBUG: Error 2835: The control ErrorIcon was not found on dialog ErrorDialog
The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2835. The arguments are: ErrorIcon, ErrorDialog,
MSI (s) (84:70) [17:06:41:623]: Note: 1: 2262 2: Error 3: -2147287038
MSI (s) (84:70) [17:06:41:623]: Product: Mere Mortals .NET Infragistics Web Controls (2006 Volume 3 for VS 2005) -- Error 1406. Could not write value to key \Mere Mortals Framework Infragistics Web Controls 2005 for VS 2005. System error . Verify that you have sufficient access to that key, or contact your support personnel.

MSI (s) (84:70) [17:06:41:623]: Note: 1: 2262 2: Error 3: -2147287038
MSI (c) (CC:84) [17:06:41:639]: Note: 1: 2262 2: Error 3: -2147287038
DEBUG: Error 2835: The control ErrorIcon was not found on dialog ErrorDialog
The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2835. The arguments are: ErrorIcon, ErrorDialog,
Action ended 17:06:43: InstallFinalize. Return value 3.