Help needed

Hi, when i starts Autocad Release 13, this message appears:
"INTERNAL ERROR: Secuence error reading initial allocation list"
What is the problem? how i can fix it? (i allready try reinstalling)
thanks //)_ ! Alex / _ ""*! / ' | ! Que el codigo fuente /. __,`\, ! te acompae -------- \_/ \ ! /=O=\
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