I've upgraded from Vista x64 to Windows 7 x64 build 7100. Everything works fairly well, except for various system applications while logged in as my normal user (which is in the administrators group). Attempting to launch the Event Viewer, for example, results in the following error: "C:\Windows\system32\eventvwr.msc Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source." This happens for many other system applications, such as Device Manager. However, if I login as the Administrator user, everything seems to work fine. Any ideas? Thanks in advance, Joe

I have experienced this exact problem. I cannot uninstall, reinstall, or update any of my existing software. I upgraded from Vista. Possible that the upgrade process is related? David

Hello J.D.,Have you been able to resolve your question? To check for damaged or corrupt files open an administrative command prompt and type sfc /scannow. Please let us know.-Scott

Joe,What happens if you create a new user.Logon with that new user on your computer. And then open the eventvwr.mscKind regardsDFTIM me

Hello J.D.,Have you been able to resolve your question? To check for damaged or corrupt files open an administrative command prompt and type sfc /scannow. Please let us know.-Scott Hi Scott, As my normal "Joe" user, I cannot open an admin command prompt--I get the same error as mentioned in the original post (note that "Joe" is in the Administrators group). Logging in as the Administrator user, running sfc /scannow indicates that "Windows Resource Protection did not find any integrity violations. Joe

Joe, What happens if you create a new user. Logon with that new user on your computer. And then open the eventvwr.msc Kind regards DFT IM me Same result--I created a new user called "TestAdmin", added the user to the Administrators group, and I get the same error trying to perform functions that require Admin permissions.

Hello J.D.,What is the User Account Control set to exactley and what happens if you turn it off?-Scott

Hello J.D., What is the User Account Control set to exactley and what happens if you turn it off? -Scott I can't tell--clicking the "Change User Account Control settings" link in the "User Accounts" Control Panel applet does nothing. The link has a shield icon to the left of it, I'm assuming that means there is some kind of permissions FUBAR? What would be screwed up that I couldn't modify my own UAC settings? Something in Group Permissions maybe? Joe

Hello J.D.,Log into the Administrator account and check your settings in Local Security Policy>Local Policies>Security Options. Can you change the UAC settings from here or is that denied as well? Also I would check other policy settings and see if something got turned on that would cause this.-Scott

J.D.I actualy out of options. But look the answer for this post. :)http://social.msdn.microsoft.com/Forums/en-US/windowscardspace/thread/43242ff3-7972-4e1d-b0c2-736653458c06It might apply to your situatation.Does this resolves your issue?Kind RegardsDFT.IM me

ok i was having this problem the solution i found is boot into safe mode and disable uac and every thing is fine , i do not know why but i upgrade from vista sp2 and the uac was disabled .

I've nuked the system from orbit and reinstalled Vista. Thanks for the suggestions. I will likely upgrade to 7 when it is released, but I think I'll start from a clean system rather than upgrade. Joe

I just installed Win7 x86 RTM Version 6.1 Build 7600 Ultimate as an upgrade over my Vista SP2 installation.Whenever I attempted an administrative task Iencountered the dreaded messages:"C:\Windows\system32\*.mscWindows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source."I contacted the Partner Site who got me to the General Tech Support and all I can say is "what a waste of time and energy".I found this message thread and by disabling the UAC in my user account after a Safe Mode Boot and then rebooting,I was able to activate and run all my administrative programs.However my customersarenot going to be happy if the UAC is disabled.There must be a solution as this occurs when using the upgrade route rather than a clean install.BTW I ran sfc /scannow and everything checked out so it is not corrupt files but some glitch in the UAC!Any ideas or fixes appreciated.rtb

SOLVED THE PROBLEM! The Error was caused by having the "Norton User Account Control tool" in Vista SP2 before the Win 7 upgrade. Norton UAC needs to be uninstalled from Vista before beginning the upgrade. If you do the upgrade withthe Norton User Account Control tool still installed you'll get the message: "C:\Windows\system32\*.msc Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source." If you do end up with Norton User Account Control tool still installed in Win 7 then do a Safe Mode Boot, and then go to Control Panel-Programs and Features and uninstall Norton User Account Control tool. This should be added to the compatibility pre-check for Win 7.

I can't 100% verify, but that is very likely the cause. I did have the Norton UAC tool installed before I upgraded to Win 7. Good work, rtheb.

Many thanks to rtheb. You nailed my problem right on the head. After I upgraded to Win7, my computer was all screwed up. I spent hours on the internet reasearching problems one by one until I ran intoyour post. I booted in safe mode, uninstalled Norton UAC and presto...all problems solved in that single action.Thanks again for posting the solution.

I want to express my sincere appreciation to rtheb for posting a solution that puzzled me for hours after I upgraded from Vista to Windows 7. This solutinion worked as exectly as described and saved me numerous hours: I planned to do a fresh install since the upgrade appeared faulty and I had not access to many of currently installed programs. Thank you so much for sharing your expertise.

Many many thanks, my hat is off to you guys and especially "rtheb". I just upgraded to Win 7 and had the same problem. I was in a catch-22 situation as I could not do anything, could not even re-access the installation CD. !!! I booted up in Safe mode, unistalled Norton UAC and Bingo I was back in business. Many thanks again.....American in Thailand