KOKOMAYLA, Thank you for using the Dell Community Forum. Boot into the system bios by starting the computer and pressing the F2 key. Once in the bios arrow down to Onboard Devices and hit enter. Then arrow down to SATA Operation. You should see ATA and AHCI on the right side of the screen. Change this setting to ATA ; I believe; ( whatever it is set to change it to the other setting)  and save the changes, reboot and you should be able to continue the install.  Once you have installed windows and loaded the drivers you will need to go and change this setting back. 
I have an Inspiron 1520. I couldnt get the computer to bring up the OS- was just running the progress bar as though the OS would boot but after quite a while-I'd get the option to start windows normally, start with prompts, blah blah blah...so I opted to start Vista in safe mode- which also wouldnt load- It would stall on a file "windows\system32\drivers\crcdisk.sys" So I whipped out my trusty reinstallation DVD for Vista-I formated both drives thinking that was the way to go, but now the installation on the OS hangs on the "completing installation" progress bar, and never completes.  Any assistance would be greatly appreciated :emotion-9:
CANNOT REINSTALL VISTA ON INSPIRON 1520