From eScan Wiki
Rescue Mode
Click this link, if you want to run the system in rescue mode. It is specifically designed to scan and clean your 32 and 64 bit operating systems, which have been infected. This mode is used when the infection is in memory or infection cannot be removed by anti-virus or malware removal tools. Rescue mode does not need any USB or CD/DVD.
In rescue mode, malware does not get loaded in memory. The Rescue disk can also update its database, if system is connected to the internet. It reverts damage done by malwares like task manager, registry editor is disabled.
On clicking the Rescue Mode link, you are prompted to restart the system.