hi guys:d today i installed my New Motherboard & RAM. im using old HDD, which had OEM XP (home, SP2) installed, so as i installed the HDD in new m/b, i used a friend's XP install Disk. during booting with XP CD, i selected to delete & format C: Drive. the installer did that & copied all the necessary files to HDD & asked to Re-Boot. when i Rebooted, NTLDR is Missing Error was shown. wat is it, i tried installing XP 2 times, sfter that i installed Vista Beta 2 (got it thru MS). so help me in Installing XP & please tell me AntiVirus, Firewall....to use in Vista. i'm not having any protection please hurry guys.