I am using Windows XP pro. My primary hard drive is ATA 112 gig
Partition C: is 30 gig with 8.7 free. D: has the remaining gig
My new drive (designated H:) is 200 gig. I tried to use Partition Magic to enlarge the C: partition, but it reports that there are problems with the drive and it is unable to do so. I used Norton Disk Doctor and I fully defragmented both partitions but it did not help.

Windows had become unstable and listed not enough room on C: as a possible problem. I have moved about as much as I dare from C:
I have a pentium 4 2GHz CPU. My system remains unstable. All programs tend to hang.

Any suggestions.

Does D have 82G? Frankly, what I would do at this point is get comething like Norton Ghost and make a clone of the C And D Drives unto DVD or an external drive. Then remove the 112G drive and install the 200G as primary. Use the C drive clone and restore the C drive, then use PM to partition the drive. Then restore the D partition.

You can then install the 112G drive as Secondary and reformat it and see if it behaves.