Where did you get the XP ISO? You need an OEM version for the Win7 version listed on the COA sticker. Then burn it to CD with ImgBurn at 4x speed.
Boot the CD, delete all partitions, create new as you wish and full format before trying install.
If it fails post back the exact error message.
Several of these I had already asked you before so don't make me repeat myself again if you want further help.