Need help cleaning PC

[kathy10]

Hi, the pc was without a proper antivirus for a while and got infected, I was able to update AVG and install Malwarebytes to remove most of the infections. The first time I was able to remove most infected objects/threats; however, I have tried 3 times to run the scan again to eliminate any remaining items and the pc shuts down without prompting the results. I assume there are still threats on the pc and need help removing them to have the computer as clean as possible. Thanks in advance for your help. 

[Firefox]

Hello and Welcome to Malwarebytes

Being that you are probably infected, feel free to follow the instructions below to receive free, one-on-one expert assistance in checking your system and clearing out any infections and correcting any damage done by the malware.

Please see the following pinned topic which has information on how to get help with this: Available Assistance for Possibly Infected Computers

Thank you