first of all sorry for my bad English..
I have downloaded windows8 developerPreview-32bit-English (2.8 GB) successfully..
made a bootable USB and tried to install (fresh install).
when it comes to expanding files at 57% it gave error code:0x80070570 and tried again.
tried to install on VMWare, Virtual Box directly with ISO..
on the other system with different configuration..
and again same error..
so, i searched on google. only the solution there may be problem with ISO is to re-download ISO..
but my net speed is very very low (download sppeds upto 12 kbps).
i downloaded it 2.8 with great difficulties.. (took 5 days to download.)
i can't download it again..
is there any alternate solution like rebuilding the ISO with working files.
is it possible to know which files of ISO are corrupted and replace them with working files..