Put the Windows 7 installation disc into the disc drive, and then start the computer.
Press a key when the message indicating "Press any key to boot from CD or DVD …".
Select a language, a time, a currency, and a keyboard or another input method, and then click Next.
Click Repair your computer.
Click the operating system that you want to repair, and then click Next.
In the System Recovery Options dialog box, click Command Prompt.
Type sfc /scannow, and then press ENTER.
Repeat the same step for chkdsk /r /f
Fix corrupt registry entries about the problem - After upgrading from Vista to Windows 7 I cannot open many files or connect to the network because 'They are not digitally signed'
The registry is a huge database where most system errors like After upgrading from Vista to Windows 7 I cannot open many files or connect to the network because 'They are not digitally signed' error come from. When a software was installed or uninstalled incorrectly, sometimes there will be some corrupt registry entries of some program files like After upgrading from Vista to Windows 7 I cannot open many files or connect to the network because 'They are not digitally signed' are left in the registry. That's why you need to regularly clean those invalid registry entries and keep the registry tidy so that such errors won't bother you.
Please Note: The system registry stores all data that all software and hardware require to run. So it's not suggested that you clean the system registry manually. You should know that a little mistake may lead to a crashing down or the corruption of the operating system
Check if hardware is working properly
If you still receive After upgrading from Vista to Windows 7 I cannot open many files or connect to the network because 'They are not digitally signed' error message after you perform a clean installation of your Operating System, it's certain that this error should be caused by a bad hardware. You can test each piece of hardware devices and find out and then replace the problematic one.
Still didn't fix it? After upgrading from Vista to Windows 7 I cannot open many files or connect to the network because 'They are not digitally signed'
How to Fix After upgrading from Vista to Windows 7 I cannot open many files or connect to the network because 'They are not digitally signed' with SmartPCFixer?
1. Click the button to download Error Fixer . Install it on your system. Open it, and it will perform a scan for your computer. The errors will be shown in the scan result.
2. After the scan is finished, you can see the errors and problems need to be repaired. Click Fix All.
3. The Repair part is done, the speed of your computer will be much higher than before and the errors have been fixed. You can also use other functions in SmartPCFixer. Like dll downloading, windows updating and print spooler error repair.
What People Say: (About After upgrading from Vista to Windows 7 I cannot open many files or connect to the network because 'They are not digitally signed')
by Ana Ramirez Apr.9th
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