Ran a full system scan for the first time after having computer for 2 years. It is stuck on disc optimization. I have iobit advanced systemcare pro 8.1 that runs frequently and defrags. Ran full system scan because computer hanging up (frozen on websites) and having to restart computer manually. no viruses found. have dell xps with a 1TB (terabite?) of memory. I have read that i shouldn't have two antiviruses running.. Not sure if i should just shut it off. Any suggestions appreciated.