Malicious computer code (101) is automatically cleaned-up from a target computer (103). An operating system (109) automatically boots (201) in the computer memory (105) of the target computer (103). The booted operating system (109) automatically runs (203) a malicious code processing script (113) in the computer memory (105) of the target computer (103), under control of the booted operating system (109). The malicious code processing script (113) automatically copies (205) and runs (207) at least one malicious code clean-up script (115). At least one malicious code clean-up script (115) automatically cleans-up (209) malicious code (101) from the target computer (103).