No OS installed during Boot

Lately I've been reading articles and guides for overclocking. Curious about my system and what my BIOS settings were, I went into BIOS and took a look. I went through the menus monitoring my vcore and temp and etc. I never changed anything. Once I knew what my FSB was and all I exited without saving. My computer restarted. It went thru the Boot cycle, and check the drives and all, and listed CD-ROM twice on the bottom and it stood there. The windows XP boot screen never came on.
So, curious as to why that happened, I restarted and ran thru it serveral times. Same thing each time. So then I went BIOS again to see if I changed anything, knowing I didnt. Everything seemed fine. So, satisfied that it wasnt the BIOS that messed it up I restarted and put in the recovery cd.
The CD-ROM sounded like it was working, it asked me if I wanted to recover. I clicked "YES". so then it continues like its going to work, but I dont notice the satus bar. I get message that there was a "read/write error" and I clicked ok. and the status bar comes up like its recovering, but nothing is being transfer data wise. so I restarted. I let the computer boot up without the recovery disk.
Now Im getting the message that theres no OS installed....
what can I do from here?
1) Buy a new OS, because theres nothing on my HHD?
2) The original Partition is gone which is why my recovery CD isnt working?
3)Something is wrong with the CD/DVD drives (both didnt want to work, although the DVD did not recognize the CD)?
Any help would be Appriciated!!!
-Omar777
So, curious as to why that happened, I restarted and ran thru it serveral times. Same thing each time. So then I went BIOS again to see if I changed anything, knowing I didnt. Everything seemed fine. So, satisfied that it wasnt the BIOS that messed it up I restarted and put in the recovery cd.
The CD-ROM sounded like it was working, it asked me if I wanted to recover. I clicked "YES". so then it continues like its going to work, but I dont notice the satus bar. I get message that there was a "read/write error" and I clicked ok. and the status bar comes up like its recovering, but nothing is being transfer data wise. so I restarted. I let the computer boot up without the recovery disk.
Now Im getting the message that theres no OS installed....
what can I do from here?
1) Buy a new OS, because theres nothing on my HHD?
2) The original Partition is gone which is why my recovery CD isnt working?
3)Something is wrong with the CD/DVD drives (both didnt want to work, although the DVD did not recognize the CD)?
Any help would be Appriciated!!!
-Omar777