MSDN SQL 2005 Setup Failure - Fixes

Fixes to couple of issues i faced while re-installing SQL 2005 on my dev box

If you get 'the system administrator has set policies to prevent this installation' issue then

1. Open regedit.exe
2. Find the registry path 'HKEY_CLASSES_ROOT\Installer\Products\'
3. Delete all the subkeys that are empty
4. Run msxml6.msi again

If you get 'higher version of MSXML6' issue then

1. Open regedit.exe
2. Find a folder similar to Hkey_local_machine\software\classes\installer\products\ check the keys inside it to confirm it is the MSXML6 parser key
3. Delete this key
4. Run msxml6.msi again