Window 7 Cant Install Again

Hi All,
now i have big problem i try but cant solve.i hope someone can slove here.
i have one hard drive on two partition C & D.
on C partition is WINDOW 7, D partition WINDOW XP HOME i have this problem in xp home Error message: "Windows could not start because of a computer disk hardware configuration problem" last time 2-3 times have same this problem i solve to use Method 2 but this time i cant solve so i try to upgrade window pro but cant upgrade i see the message
error loading operating system
then i cant open also wndow 7 after i try to agian install window 7 but after restart pc i see only this message press any key to boot from cd or dvd.....
cant work after this merssage.pls help me urgent bcoz i dont want to carry for repair.Thx very much

This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.