Why am I getting this Error Msg?

I keep getting the following error message whenever Avast tries to update.

"Information about current update:
Last encountered error: Not enough storage is available to process this command.

Total time: 32:30"

I’ve got plenty of available space on my HDD so, what does this mean?

I’m running WindowsMe on an older Dell Inspiron laptop.

“Not enough storage” error when updating the virus database
See, http://forum.avast.com/index.php?topic=45169.0