super hidden virus on my PC! please help

i don't really know how but yesterday I some how got a virus on my PC that slows it down a lot and lock my fps in games to 30 and 40 (had before more that 60). desktop is stucky and my computer works very slow and stuck.
tried to restore system back in time from 5 in February, didn't work. ran a full scan in windows defender and it happened to use 97% of my CPU while scanning. tried to do an offline scan but in the middle of the scan it just stopped, windows defender closed and had a blue screen for 10 seconds and than it restarted. didn't help. tried to do a prereboot scan in avast an didn't find any threats. something strange is that only when I open task manager, the virus suddenly stop working and everything works fine but when I close task manager it quickly starts working again and my whole computer is getting slow and stuck. please is there any free antivirus program that can help me? or the last option is just to format my computer?
please I need help! any scan that I did with windows defender or avast didn't find anything. please help me!

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forgot to mantion

running windows 10 64 bit.

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Re: format

You don't format a computer. You format a partition on a storage device. Then it's empty. That's all.

The right terms for Windows 10 are refresh and reset, and the object of those verbs is "Windows" not "my computer". If even reset fails, you reinstall the latest version (first without formatting the c:-partiton, then with formatting) from the USB-stick or DVD you make with the Media Creation Tool.

Read about it in

For the future, consider making an image backup to go back to. More reliable then System Restore. it helps to have different partitions for the OS and programs and for your data. Then restoring the image of the OS partition doesn't affect your data.

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Try Malwarebytes

Try to download and run Malwarebytes.exe That MAY help!!

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Best Solution

If your system is slow, then it would surely be a Malware infection. Download and install Comodo Antivirus.

I had a similar problem last month, and I used Comodo Antivirus. It had detected a Malware and removed it completely. Finally, I rebooted my system, and everything worked like a charm, thanks to Comodo!

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maybe a windows 10 update messed it up

Been happening to many others. Typical fix is to reload the computer driver files supplied by the computer manufacturer, or from the motherboard supplier. If that doesn't fix it, then definitely check for malware.

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