I have a Dell 4300 running Windows 2000. My hard drive is partitioned with Partition Magic. It has worked fine for over a year. I can run defrag on every drive but my "C" drive. This is where my system resides. If I try I get this error message: "Instruction at 0x77fcb2b9 reference memory at =0x00000000. The memory could not be written." It also tells me it cannot perform the operation and an error report has been written. Is this normal or there is a problem. I feel my system is becoming a little sluggish. I did notice that the other partitions are labeled ntfs and the "C" drive is labeled FAT 32.