My McAfee keeps turning off real time scanning. I have windows XP service pack 3, have reinstalled the program several times and keep getting the same issue. I do not have any other virus scanning softward installed. Also, when updating, it slows my computer down to a crawl until it completes. My computer is 4 years old, lots of memory and 1 terribyte hard drive. Thank you. Virtual tech assistant does not find any issues.