If VIRUSfighter is not able to find or remove an infection, then there can be a couple of reasons for this.

1) It is spyware or a 'mixed threat'
A 'mixed threat' means that the infection acts as both spyware and virus. VIRUSfighter has a limited capability versus spyware, so if the infection you have on your computer is either spyware or a mixed threat, then you should utilize both an anti-virus program as well as an anti-spyware program.

We have an anti-spyware program, called SPYWAREfighter, which you can try free for 30 days.
* Install SPYWAREfighter from here: http://www.spamfighter.com/SPYWAREfighter/
* After installing run a full scan with SPYWAREfighter.

2) It is an infection which you have been tricked to install yourself
Some infections trick you into installing them yourself even if you do not wish to do so. Since you chose to install the infection yourself, antivirus and antispyware programs consider the infection a legitimate program.