Quote from the description:
Dr.Web CureIt is a standalone anti-virus and anti-spyware scanner that scans your PC for viruses, trojans, adware, spyware, hack tools, rootkits, and other malware. The program does not require an installation and can be run from a USB drive. This is an on-demand scanner only, it can detect and remove virus infections but does not provide any real-time protection. Dr.Web CureIt is based on the ICSA certified Dr. Web scanning engine and should provide reliable detection.
Pros: No installation needed; scans for a wide range of viruses
Cons: No real-time protection; updates require re-download of the entire program
I experienced a few portable anti-virus programs on the basis of the LiveXP project, ClamWin Portable I have not worked, only after unpacking cureit.exe by 7-zip to usb flash and launch _start.exe was able to use this program.