IE 8 issue: Message: Library not registered.

I installed Outlook 2010 but I kept Office 2007. After that for some reason I reverted back Outlook 2007. When I opened SharePoint home page, the scripts cannot be loaded and I've got an IE error:

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Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.2)

Timestamp: Thu, 8 Jul 2010 14:15:57 UTC

Message: Library not registered.

Line: 2367
Char: 2
Code: 0

URI:http://sharepoint_server/_layouts/1033/init.js?rev=qX%2BG3yl4pldKy9KbPLXf9w%3D%3D
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Solution is to run Office Diagnostics from Help menu of Microsoft Office Outlook 2007.