TortoiseCVS: cvs [update aborted]: cannot rename file _new_example.html to exam

I got the following error when trying to do and update using TortoiseCVS via a cvs:

cvs [update aborted]: cannot rename file _new_example.html to example.html: Bad address

I reported it to TortoiseCVS here:

https://sourceforge.net/tracker/?func=detail&atid=451972&aid=3009869&group_id=48103

I disabled Avast for 10 minutes and tried again. It worked.

Therefore, one would assume there is a conflict between TortoiseCVS and Avast.

Can this be resolved without having to disable Avast or exclude the directory?

Thanks.