Unable to open attachemnts in Yahoo mail


New Email
Guys please help.

I cannot open any attachments in my yahoo email. If I click on them nothing happens. I reboot and maybe 1 will open then nothing again. Only opens them now and then.
When I click on it it says scanning and then continue appears. When you click on continue......nothing happens.

I am running McAfee anti virus. Tried deleting temp files, cache etc but no help. Still only opens 1 attachment now and then.

This has only recently started happening. I had no problems 3 or 4 days ago.

Any help would be great.