1) I have Symantec for some time - no problem 2) Then I install McAfee, both Symantec and McAfee running within the same pc now. -> PC Slow. 3) Uninstall Symantec and now have McAfee only. That is when I started to have Svchost error message pop out now and then complaining about "The memory could not be written". I cannot simulate what causes the svchost error. It just pop out now and then and I cannot see the pattern of action that trigger it. Perhaps a background process causing this. Initially suspect Conficker. Use other antivirus tools to scan and clean the PC, but not resolving the problem. Have applied Microsoft patches as per their Conficker technical article, but to no avail. What's wrong? Is this being caused by the McAfee? Anyone have the same experience?