Can't use burn-at-once option in nero 8 recode?

when i check burn-at-once option with nero 8 recode, it fails burn and says out of memory? if i don’t check the box, it burns perfect every time? what i don’t get is i have 4 gigs of DDR II 533/5300 Memory Intel Q6600 Quad 2.4 GHZ Processor and Windows XP Home. i have tried nero reinstall and everything i could think of with no luck. anyone at all, have any ideas? oh, i even installed nero 7 with same results. :sad: