No Operating System Found

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I am a newbie at using Ubuntu. I installed it off of a Ubuntu live CD onto my PC currently running Windows XP. The hard drive was partitioned successfully. Now, when I remove the Ubuntu CD, I receive the following error message: 'No Operating System Found'. I would like to restore my Windows environment. Any suggestions? Hopefully, I have not caused any damage to my hard drive. By the way, I don't have a Windows XP recovery CD available. I ran the commands below based on the advise others gave to individuals with a similar problem on other sites. Thank you in advance for your help!

$fdisk -l

Device Host Start End Blocks ID System
/dev/hda1 1 784 6297448+ 12 Compaq diagnostics
/dev/hda2* 785 12161 91385752+ 7 HPFS/NTFS

$cat /etc/fstab

unionfs / unionfs rw 00
tm fs / tmp tmpfs nosuidg nodev 0 0