FastScan is the component of Trojan Remover which runs each time you start your computer. It carries out the same scanning functions as are carried out when you run a Scan from within Trojan Remover itself.
When a suspicious file is found being loaded via a call in the SYSTEM.INI file an alert screen is displayed. This screen shows the name of the file being loaded, whether it is being called by a shell= or a scrnsave.exe= line, and the line number in the system.ini file in which the call was found.
Once the scan is complete you should start Trojan Remover to remove this Malware.