Disk Cleanup , I'm assuming this is a Windows computer.
Helping a friend who's Toshiba laptop is "running slow". The culprit is a full hard drive, with updating bound up waiting to do it's thing. It's (C) > Users > Name > App Data > Local Low > Calling ID. This Calling ID folder has 511 GB! I haven't been able to find any info on this. I'd like to know if I can simply delete the contents of the Calling ID folder.