This an error from the physical memory being full or over capacitated.
Login error 41 from the apple support page on error codes. It may have something to do with time machine still in process. Try to quit the process from time machine, clear the cache, delete the recycle bin, clear the history from safari and reboot. If you are still getting this error and not able to log in at all then this
fourm on macbook error should help. If all else fails then a clean reinstall of the os from its original disc should solve this issue. (Remember this is your absolute last solution if all else fails). There are stuff around the net about fixing this issue or just contact apple support.
Hope this helps.
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