my os is win7 and I can't install this https://support.microsoft.com/en-us/help/17588/windows-fix-problems-that-block-programs-being-installed-or-removed I don't have any virus-scanner but I can't open it
Try installing this: https://support.microsoft.com/en-us/help/2533623/microsoft-security-advisory-insecure-library-loading-could-allow-remot
what I have to download
oopo5233
One of those, depending on whether you have a 32 or 64 bit system.
If unsure just install both