Well, Comodo may have been causing a problem but that wasn’t it at all. It is Avast after all!

I just tested a move from one folder to another, on the same partition, and Avast completed choked up my system while the File System Shield took over. I moved a 153MB exe, an SFX 7-ZIP archive from Hewlett Packard containing drivers, and Avast’s FSS scanned it, and the system became unresponsive until it had finished…and 3 minutes in fact. Process Explorer shows the CPU shoot up and it stays there all the time. The file then does not appear in the folder to which it was moved until Avast ‘lets go of it’. Snaps attached. I disabled the FSS and tried it and all worked fine. Reenabled the FSS and problem back.

Now that definitely wasn’t happening before.