when setup windows the partitions is not apear

Hi Mohamed, if you're installing a new and/or known to work hard disk, make sure the hdd is properly plugged to the motherboard and power supply first; for the latter, you could also plug a different device like an optical disk drive if you're not sure the hdd is receiving power. Look at the (sata/pata) data cable, if you notice it's damaged / not in good working condition and you happen to have a spare one, try using it instead.

If this doesn't work or you're not updating the system with a different hdd, then check if is listed in the BIOS System Info tab: to access System Setup press <F2> key when the Dell logo appears after turning on the PC.

If the "Windows cannot be installed to this disk. The selected disk has an [MBR/GPT] partition table." error appears during setup, it means your hdd partition style doesn't match the motherboard current firmware, and you might have to switch to UEFI/legacy mode

Let us know if any of these solutions worked