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If you have experienced any slowness, or unwanted behavior on your computer and you are unable to install any anti virus or anti malware then do the following:
1. Download Malwarebytes installation file to a USB flash drive *using a different computer* from this link: download Malwarebytes
2. Start the infected computer in "SAFE MODE" - See number 4 on how to start computer in SAFE MODE
3. After you start in Safe Mode, you can install Malwarebytes using the USB flash drive. Then run a full scan. After scan is complete it will give you option to delete all the malwares. Make sure you delete it. Also there should be a "Quarantine" tab, make sure you delete everything from the quarantine tab as well.
4. How to start in safe mode:
Safe mode starts Windows with a limited set of files and drivers. Startup programs don't run in safe mode, and only the basic drivers needed to start Windows are installed. For more information, see What is safe mode?
Safe mode is useful for troubleshooting problems with programs and drivers that might not start correctly or that might prevent Windows from starting correctly. If a problem doesn't reappear when you start in safe mode, you can eliminate the default settings and basic device drivers as possible causes. If a recently installed program, device, or driver prevents Windows from running correctly, you can start your computer in safe mode and then remove the program that's causing the problem. For more information about troubleshooting problems in safe mode, see Diagnostic tools to use in safe mode.
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Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer.
Click the Start button
, click the arrow next to the Shut Down button 
, and then click Restart. -
Do one of the following:
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If your computer has a single operating system installed, press and hold the F8 key as your computer restarts. You need to press F8 before the Windows logo appears. If the Windows logo appears, you'll need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer.
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If your computer has more than one operating system, use the arrow keys to highlight the operating system you want to start in safe mode, and then press F8.
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On the Advanced Boot Options screen, use the arrow keys to highlight the safe mode option you want, and then press Enter. For more information about options, see Advanced startup options (including safe mode).
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Log on to your computer with a user account that has administrator rights.
When your computer is in safe mode, you'll see the words Safe Mode in the corners of your monitor. To exit safe mode, restart your computer and let Windows start normally.