If you recieve a call saying your computer is infected.
“I get a call early in the morning from a guy named Charlie (aka. Raj) claiming to be from Microsoft telling me my computer has virus called Code Red. I decide that Charlie needs to have an hour of his day wasted because you guys need entertainment and these scammers need to be taken down.”
This is where windows stores all its backups of previous updates. It can grow quite large but don’t be tempted to go in and start deleting files, you may well trash your system.
For more information take a look here