Of the categories of utility programs listed below, which have you used, what have you learned from

Question:

Of the categories of utility programs listed below, which have you used, what have you learned from these products, and what level of satisfaction have you had with them?
If you are a Mac-user, interview a windows-user for answers and indicate that in your response.
Antivirus program [protects your computer against computer viruses] Personal firewall [detects and protects a personal computer from unauthorized intrusions] Spyware remover [detects and deletes spyware]