While I was overclocking my cpu I decided I didnt like the settings so I pressed load default settings and then after I try to boot up it says no operating system found.

Check your BIOS boot priority, make sure the hard drive your OS is installed to is listed first.

Im at the bios boot priority and I have 2 hard drives but all i see is. 1st [1st floppy drive] 2nd [SATA: PS-ST3500630A] 3rd [CDROM :SS-Optiarc D]

Is the 2nd drive the one you have your OS on? If not, try selecting it and changing it to the HDD you have the OS on.

Uhg, what are you doing still running an IDE hard drive? Are both of your hard drives chained Master and Slave or on different controllers?

Change your first boot priority to your hard drive. PS-ST3500630A is your Seagate 500 GB IDE drive. If that's the one with Windows installed on it, select it, otherwise change your hard drive priority to the other one.

No I have the OS installed on the C drive and the only things on the boot priority are the 3 things i mentioned before and i cant change them around only change their number in the order

BIOS doesn't give a crap about things like "C drive' that's useless information. Is your C: drive 500 GB? What's the size of your other drive? Change your hard drive to first priority.