new computer and my big mistake!!

I just bought a new acer computer and when I got it it wouldn't boot into windows. Before I rang tech support I tried an Acer recovery disk that I already had from another computer( I know I should have rang tech support first). This worked but now I am running an older version of XP that installed to the C Drive than the XP Media Centre edition that the computer came with which is on the D drive as well as the Acer utilities (The computer has three partitions.)
Is there any way I can delete the older XP from the C drive and restore the newer version from the D drive. The machine didn't come with any disks which would make it easier.

Please help

 

If you bought it brand new from the store then you should've immediately called acer and sent it to them to fix it. It should definatly still be under warrenty if you just bought it. I'd be so pissed if I bought a new pc and it wouldn't boot, lol. point is, you shouldn't have to fix a new pc. I'd definately call them and tell them what happened or just take it back to the store you got it from (if bought at local store) and get a replacement one.

good luck