AeroAdmin.exe is a remote desktop software which provides a remote desktop connection from one computer to another over the Internet. It allows full remote computer control including screensharing, mouse and keyboard remote control, remote file transfer, unattended access etc.
900100.net is an alternative short domain for the official AeroAdmin LLC website aeroadmin.com which you can visit to get more info about AeroAdmin application.
Do not accept help from unknown callers. AeroAdmin, Microsoft, or your ISP will never call and charge you.