The folder fs-capricorn in Windows temporary folder fills up hard drive
In C:\Windows\Temp\, the folder fs-capricorn fills up hard disk with files named AV-malware-names until there is no free space left
The files in the fs-capricorn folder are normally deleted when the computer is shut down. Unexpected system crashes can cause a situation where the files are not automatically removed.
You can safely go ahead and manually remove the AV-malware-names files in the fs-capricorn folder. Take note that some of the files can be in use and locked and therefore they cannot be removed. You can skip the removal of those files.