1. A method for blocking pestware activity, the method comprising: detecting an initial pestware activity on a protected computer; recording the initial pestware activity; receiving an instruction from a user of the protected computer to block the initial pestware activity; blocking the initial pestware activity; detecting a subsequent pestware activity; comparing the subsequent pestware activity with the initial pestware activity; responsive to the subsequent pestware activity matching the initial pestware activity, automatically blocking the subsequent pestware activity; identifying a process responsible for the subsequent pestware activity; identifying, on a storage device, a program file corresponding to the process; injecting termination code into the program file corresponding to the process, the termination code determining whether the process is permitted to restart from the program file subsequent to being terminated; and terminating the process; wherein the termination code is configured to: cause the process, upon attempting to launch itself from the program file subsequent to being terminated, to compare itself against a list of pestware that is targeted for removal from the protected computer; prevent the process from starting up when the process matches pestware in the list of pestware that is targeted for removal from the protected computer; and permit the process to start up normally when the process does not match any pestware in the list of pestware that is targeted for removal from the protected computer.