I clear my temp files daily and now I have this in my temp folder:
What is it and why can't I delete it?
Not all temporary files are deletable. It must be associated with the protection of your machine.
It finally went away by itself.
I think when I rebooted
Temp files should be deleteable unless they're open and being used at the time (which some of them might well be, if they're having log data written to them).
you shouldn't worry too much; temp files hide in a hundred locations, and the only times they're a problem is if your disk is getting short on space, or if the sheer number of them is slowing things down, or if some spyware or other malware has been infiltrated onto your system and is sitting in a temp directory (the fake antivirus programs often put files in there).
If you want to clean up the disk, Windows has a built-in program (cleanmgr.exe) which does a reasonable job. There's also CCleaner, which is okay for clearing out all the remaining temp junk that cleanmgr overlooks.
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