I think that my hard drive has been infected by a virus, I don't understand. he refuses to install programs as basic as the Adobe reader, something about the missing keys or that i do not have permission. Help, please

whenever I try to install a program, a program of games even it is said of the missing security keys (in a way he described the characters in them, a short letter) or sometimes says that I don't have permission to make these changes.

Hello

1. What is the exact error message?

2 have you made any changes to the computer, before the show?

Method 1:

Run this fixit and check.

Solve problems with programs that cannot be installed or uninstalled

Method 2:

I suggest you to run a virus scan and check.

http://www.Microsoft.com/security/scanner/en-us/default.aspx

Note: The Microsoft Safety Scanner ends 10 days after being downloaded. To restart a scan with the latest definitions of anti-malware, download and run the Microsoft Safety Scanner again.

Note: All data that are infected can only be cleaned by deletion, which means that there is a risk of data loss.

Tags: Windows

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