At first remove malware consequences...
Scan PC - remove viruses. Install antivirus software and install antispyware.
At second remove consequences of Windows 10 tasks...
Clean up Windows 10 using PC Cleaning Software

How to clean up Windows 10 for better performance

1. Windows 10 cleanup - HDD cleanup:
in the search box like Type here to search type disk cleanup and press Enter, in the opened windows select a drive С and click ОК

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Check: Setup Log Files, Downloaded Program Files, Temporary Internet Files,
Recycle Bin, Temporary Files, then ОК and Delete Files.

2. How to check and repair bad sectors of hard drive::

• Close all windows.
• Click Start - Windows System - File Explorer - This PC.
• In the window like This PC, select Local Disk(С:) and open right click menu, where click Properties.
• In the window like Properties click Tools.
• Click Check.

and click Scan drive.

3. Windows 10 cleanup - $NtUninstall and .log files
Close all windows. Click - Start, in the search box like Type here to search type %temp% and press Enter. Select all the files using buttons (Ctrl+A), delete all the files using a button (Del).
Click - Start, in the search box like Type here to search type C:\Windows and press Enter. Select files like $NtUninstall and .log, delete all the files using a button (Del).

4. The browser cache (memory) cleanup
the browser cache cleanup using CCleaner - the browser opens very slow: begin
Chrome - clean up a browser cache
Firefox - clean up a browser cache

5. Remove unused components of Windows 10
Remove unused components of Windows 10 for better performance:
Start, in the search box like Type here to search type Control Panel and press Enter. Next click Uninstall a program - Turn Windows features on or off, uncheck unused components of Windows 10,

click OK. Restart PC.

Warning
You can add components of Windows 10 back using Windows 10 installation disc only.

6. Remove unused startup programs
Speed Up Windows 10 booting:
Start, in the search box like Type here to search type task manager and press Enter, click Startup. In the list select an unused program and click Disable.

Restart PC.

7. Remove unused program
Uninstall or change a program:
in the search box like Type here to search type Control Panel and press Enter. Click Uninstall a program,
select it from the list and then click Uninstall.

8. Defragment a hard drive

• Close all files and programs.
• Click Start - Windows System - File Explorer - This PC.
• In the window like This PC, select Local Disk(С:) and open right click menu, where click Properties.
• In the windows Properties click Tools.
• Then Optimize.

Select partition, click Optimize.

Repeat for all partitions. It is possible to set a schedule for defragmentation (Weekly).
Click Change settings

9. Rebuilding damaged Windows 10 .Dll files
Rebuilding damaged Windows 10 .Dll files - in the search box like Type here to search type cmd, right click Command Prompt and then click Run as administrator.

Then type: sfc /scannow iand press Enter. Rebuilding damaged Windows 10 .Dll files is sterting... At end you see:

10. Clean up registry automatically
Clean up registry automatically using cleaning program install a cleaning program

11. Clean up registry manually
Remove registry records of uninstalled program:
in the search box like Type here to search type regedit, right click button regedit,
then click Run as administrator - Yes.
On the left of the opened window double click follows:
HKEY_LOCAL_MACHINE,
SOFTWARE,
then click a name of uninstalled program,
then right click a name of uninstalled program,
then click Delete - Yes.

Then in the search box like Type here to search type regedit, right click button regedit,
then click Run as administrator - Yes.
On the left of the opened window double click follows:
HKEY_CURRENT_USER,
SOFTWARE,
then click a name of uninstalled program,
then right click a name of uninstalled program,
then click Delete - Yes.

12. Remove restore points
When your PC works well, then you can remove restore points of function System Restore.
This action frees up the hard disk (1-25GB of memory).
Start, in the search box like Type here to search type disk cleanup and press Enter, select partition С and click ОК

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then Clean up system files.