Right click on the file & go to properties & uncheck the read only box. Press apply then try deleting it.
Or
Download moveonboot from
here & the file(s) you choose will be deleted on reboot.
MoveOnBoot allows you to copy, move or delete files on the next system boot. This comes in very handy, if you need to replace or delete files which are locked by other applications, loaded into memory or cannot be changed until next system boot. You could manually enter a line to the wininit files, but using MoveOnBoot is much simpler, since the program can be integrated into shell - it creates the "Copy/Move/Delete on boot" context menu item.
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