@usmanfayyaz it would be nice to see what the message was all about. If you installed a new version windows and it is still doing that, you need to most likely reformat your drive and reinstall your OS. Of course you know that would mean you will lose your files etc, so you need to back those up first.
Go into your BIOS and set boot order to a USB port. Did you try to boot in safe mode and uninstall your freshly downloaded "Software"? Get a malware/antivirus software and install that on a bootable drive. Then start your computer up and check it for malware / virus. Just to make sure
Get a bootable USB drive and start your computer from there. Then try to access your HDD and move your files to a different drive. Then format your drive and reinstall the OS.
Of course, this message could be absolutely benign but until we see what it say, it's hard to determine.