Thunking Error

Thunking spooler APIS from 32 to 64 has encountered a problem and needs to close.

This is the error im getting after being in autocad inventor for a while and trying to print, this is a new problem for us, and just started after a upgrade to xp64, has anyone ever seen this error? and if so, how may i fix it, i am unable to find anything out on it. thanks