I have been trying to copy data from the C: drive to a CD. I tried before and it was okay. Since, I did download McAfee antivirus to the system and the system updated to Microsoft Service Pack2.What should I have do at this point. I need to backup data for my business.

Also, I have another question....I have McAfee antivirus, Microsoft antispyware and Windows antivirus all on my system. Is it necessary to have all of this? If not what should I keep and what should get rid of? The system is used for my business.
Thanks
DGray