Hey my Pc runs great but when i run chkdsk it says there are one or more errors does that mean on the hard drive or the OS

Don`t worry, it`s just like an invalid file or something like that on the disk. The OS and the disk physically is OK.

Best advice I can give you is to download the Hard Disk Utility from the manufactures web site that makes your HDD. It will scan the HDD and detect a physical problem. Also, does it give you a choice to fix the problem or tell you what the problem is? Later, KTTD

You need to schedule chkdsk to run after a reboot in order for it to fix the errors. Press the Start button, click Run, then type chkdsk /f then hit enter. When it asks if you want chkdsk to run at the next boot, answer y and hit enter. Then restart the computer.