Ultimate Boot CD

Just downloaded parted magic and gparted from the their respective websites and they worked fine :S

Im running the latest version of UBCD, but when i try to run gparted, or parted magic, it gets to decompressing linux, then i get this error:

LZMA data is corrupt
-- System halted


Other tools seems to work fine, i tested prime 95, wdidle and a couple other ones.

Any ideas? Thanks