Windows 7: & installation prob

hi i have a dell inspiron 1525 laptop....when i install windows 7 ..during the file extracting process a blue scrren appears an installations stops....the error code is 0x80070570..plzz help up stuk with no OS on my laptop

Where did you get Windows 7? If you burned the DVD, try burning another using ImgBurn at 4x speed.

Consider trying install from flash stick: USB Windows 7 Installation Key Drive

Make sure you have the latest BIOS version update, if so then reset the CMOS: Clear CMOS - 3 Ways to Clear the CMOS

Set the SATA controller in BIOS setup to AHCI first, then IDE if necessary.

Test your RAM with memtest86 CD scan for 5-6 passes. Remove all but 2gb of RAM to try install, swap RAM.

Test your HD using maker's full diag/repair CD scan: Hard Drive Diagnostics Tools and Utilities (Storage)