installation crash at 85%

[joker88]

Hello all,

i was installing backtrack4 from live usb and it always gives me an error when it reaches 78% when says configuring system locals... and because i was runniong live cd i caouldn't save the error,
i have chicked the md5 hash, it matched the hash in the download page

my laptop is acer aspire 2920z
while running the live cd, it works perfectly with all drivers but while installing... the error happens

please help.
thanx

[joker88]

how come, still have no answer yet,
please help me out people

is it because i didn't define a swap partition?

[lupin]

Try reburning the DVD at the slowest possible speed.

[joker88]

i also tried using the unebooting program to restore a clean iso image in to an empty 8gb usb drive,
it works fine with the live mode... when it comes to the installaton, it still gives me the same error when it reached 78% ( configuring system locals)
i tried installing it in vmware mode , but as far as i know, it won't support built-in wireless cards
is there anything else i can try