When CCleaner removes the following registry entries, Windows Live must do a partial reinstall on initialization.
HKCR\CLSID\{AB1D8565-40E9-4616-984D-98465687E82C}
HKCR\CLSID\{B69003B3-C55E-4b48-836C-BC5946FC3B28}
HKCR\CLSID\{FB7199AB-79BF-11d2-8D94-0000F875C541}
Just thought I'd let you know.
I don't have the patience to search for this, so if it's already mentioned just remove this thread.
Thanks.