Active scan - Scans common loadpoints ( like startup files, few registry entries,C:\Windows, Temp and User Profile ) and memory. Its is a scan which normally takes 2-5 minutes
Scans the memory and other common infection locations on the computer for viruses and security risks.
Scans the entire computer for viruses and security risks, such as adware and spyware. Use this scan to look in the boot sector, in the programs that are loaded into memory, and in all files and folders. A password may be required to scan network drives.
Scan only the files and directories that you specify.