hello I have a Dell Dimension 4600i - processor = Intel(R) Pentium(R) 4 CPU 2.66 GHz - Processor speed = 2.60 Ghz - Memory = 512 ram - running Windows XP Home Edition - Operating System = 5.1.2600
Now every time I try to defrag the C/ I get this message

Disk Defragmenter has detected that Chkdsk is scheduled to run on the volume:(C:)
please run Chkdsk /f.

How do I stop this? Or what should I do Please?

Try a proper disc defragger rather than the inbuilt Windoze one.

Defraggler - File and Disk Defragmentation - Free Download is well worth a go and it's free..