What is USOPrivate?
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USOPrivate folder contains XML files with basic update info and links in them, while the USOShared folder contains ETL files that are system logs. It is clear that both folders serve a different purpose, even when they fall under the same Windows Update service.
Can I delete USOShared folder?
To answer your query, you may delete these files and deleting will not affect anything on your system.
What is the Programdata USOShared logs?
The USOShared folder contains which belong to the Windows Update service . I presume those files are etl files – ETL – Event Trace Log file which is created by Microsoft Tracelog, a process that creates logs using the events from the kernel in Microsoft operating systems.

What is $WinREAgent folder?
The $WinREAgent folder is created during a Windows Update or upgrade and contains temporary files that allow you to recover Windows 10 if there are problems during the upgrade or update.
What is Boost_interprocess?

The boost_interprocess folder is one of the methods for inter-process communication by means of shared memory, and you may see this folder on other OSs since it is a boost mechanism. The file(s) you see in the folder are named shared memory objects.
Can I delete package cache?
Microsoft warns against deleting them because these caches contain installer files for various applications on your computer that are useful for repairing, uninstalling, modifying, or reinstalling programs. If you delete the caches, Windows may not be able to carry out these modification operations.
Can I delete CrashDumps?
Crash Dumps Likely safe locations to delete files and folders from: C:\Users > username > AppData > Local > CrashDumps. C:\ProgramData > Microsoft > Windows > WER > ReportArchive.
Should I delete $WinREAgent?
Can I Delete the $WinREAgent Folder? The short answer is yes; you can delete the $WinREAgent Folder. Before deleting the $WinREAgent folder, we would check for, and install any pending Windows Updates – if you don’t have any updates available, reboot and remove the $WinREAgent folder if it remains.
Can I delete $SysReset?
How to delete $SysReset Folder. Deleting it is simple. Simply right-click on the $SysReset folder, and then select the Delete option to move the folder to Recycle Bin. If you would like to remove the folder completely, select the folder, hold down the Shift key and then press the Delete key.
What is program data package cache?
Package cache is usually found in C:\ProgramData\Package Cache\ and is the source of installed packages for visual studio and other related products.