F flipflip Member Joined Jan 19, 2014 Posts 15 Jan 19, 2014 #1 Hi, I'm trying to update my Windows 7 64 Bit Home Premium OS to SP1, so that I can run an upgrade install to hopefully rectify some corrupted files. The problem started months back when I was not being able to update iTunes or Adobe, and at the time I thought I had traced it down to an msi installer issue. I didn't have time to sort the problem out as I have had professional exams every month since Sept '13. Finally they have finished for a little while! I'm still unable to install selected files that require msi. I have downloaded SP1 and attempted to install manually and it won't work. I have performed an SFC scan, and there are known errors - however I can't open the CBS log as I get an error "CBS You don't have permission to open this file Contact the file owner or an Administrator to obtain permissions" I'm logged in as the admin, and still receive this issue. If anyone can offer any help it would be greatly appreciated. I have read so many Microsoft support threads I'm beginning to question my sanity.