So you used Vista upgrade disk?
How to install vista upgrade dsk:
1,First you install XP.
2,you update instal SPs etc.
3,you then insall Vista upgrade disk.
AS you wiped HDD via brothers computer then XP is no longer presant.
I sugest you do numbers 1,23.
Then see if you get NTLDR is missing?
If you do then I will get you links for boot disk NTLDR is missing.
If you dont then just update XP and then install Vista.
Wich XP are you using?