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 TOSHIBA Configuration Builder CD Tecra 8100 Series to respond slowly or provides an M0040780.EXE error, possibly due to file conflicts or an overloaded hard drive.