This has nothing to do with the MSBlast, or with any other virus. I also saw this kind of error.
In the case that I saw:
When you load up Windows, for quite some time there is an X mark on the resident icon of Avast. If you click on it, you'll get this error message, that there are some RPC error. Then, after you waited enough time, the RPC call has a timeout, and the antivirus' resident protection starts to work. It seems to be a problem with the startup of the antivirus. I saw this only on one computer (of a friend of mine). It might take, however a few minutes until the real time protection starts to work, but it always start.