Not all malware, spyware or viruses can be removed automatically by software. Some intrusive software can only be removed manually. Safer-Networking Ltd, as well as providing a free edition of their malware removal tool Spybot Search & Destroy, also provide free malware removal guides. You can access this valuable resource here:
Spybot is maintained by a team of people very dedicated to privacy issues, many of which are working full-time on analysing masses of new threats each week, and the response time from our support team is better than that of many a commercial vendor. We would appreciate it if you would honour our efforts with a moderate donation.