remote PC support and screen-sharing
Download from PortableApps.com
TeamViewer Portable can run from a cloud folder, external drive, or local folder without installing into Windows. It's even better with the PortableApps.com Platform for easy installs and automatic updates.
TeamViewer contains support, administration and screen-sharing in one package. It can do remote administration of unattended servers, file transfers, remote support without installation, remote presentations, and more. TeamViewer supports key exchange and AES (256 Bit) session encoding and works behind firewalls.