Can I use SPYWAREfighter which scans for viruses together with another antivirus program than VIRUSfighter?

SPYWAREfighter only scans for viruses if VIRUSfighter is installed. If VIRUSfighter is installed, then customers are STRONGLY recommended NOT to have another antivirus installed. But, if you are using JUST SPYWAREfighter, then yes, you can install another antivirus software (and are strongly recommended to do so.)