Step 3: Clean Out Your System Junk (Temporary Files and Folders) With Disk Cleanup (cleanmgr) Over time, your computer accumulates junk files from normal web surfing and computer use. If this junk isn't occasionally cleaned out, it can cause McAfee AntiVirus Plus 2010 to respond slowly or provides an sacomm64.cab error, possibly due to file conflicts or an overloaded hard drive.