Ransomware Problem

Hi,

I started to run CCleaner when suddenly an FBI alert popped up and said I was using this computer illegally. I rebooted in safe mode and ran Super Anti spyware. It found four infections. I removed them and rebooted. Same FBI screen again. I then downloaded the lastest version of Malwarbytes on to a flash drive. I went to reboot again in safe mode and I receive an error message that it cannot find the operating system. Am I completely screwed?
Thanks in advance for any help.

 

Windows 7 64 bit. I do not recall what was removed and now that I cannot boot up I cannot look at the log. I am wondering if removing the cmos battery would reset the bios to at least allow me to get in. Thanks for any ideas you may may have Chas.

 

Success! I figured out the problem of no os found. I corrected that problem and ran Malwarebytes. Virus removed. Thanks again for trying to help.