I have been in contact with MS people about this on Microsoft Answers (see http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_upd ate/problems-with-a-corrupt-lightroom-44-catalogue/148411d3-d801-4577- add0-2c9cceb5a1b4).
They have asked if Lightroom 4.4 is fully supported in Windows 7 with IE10 installed. Could you please advise.
Thanks