Merge Partition

You might want to take a look at this:
http://www.partition-manager.com/home/personal/features.htm
It's not free but it looks like it will do what you want.

There's a free partition manager which has been around for a number of years and many people use it. Ranish Partition Manager is it's name, it's free and you can find it here:

http://www.ranish.com/part/

Stan
Stan Brager

Here is what I use. Assuming that you have software that can remove a partition, and expand your C partition into the old space of the D partition, such as Partition Magic. I gem from the old DOS days is the SUBST.exe program. It is still distributed with Microsoft OS's in the \SystemRoot\System32\ directory. If your C drive can initially hold the contents of your D drive, copy the contents of D into a directory like c:\DriveD\, then make a batch file with the line
SUBST D: C:\DriveD
and put this batch file in your start up group. If your C Drive is not large enough, you will need to work out someplace to store it untill the partitions are resized.

I'm going to look at this and get back to you, but I do know this.
Within the windows XP , go to Control Panel, then to the Administration Tools area there is an area called Computer Management then Disk Management. In this area, you can turn your C:\ drive into a dynamic drive and merge it with your D:\ or vice versa.
There is nothing to buy,it's already built in.
To be completely honestly I'm not exactly sure of the "Exact" procedure and this is important, hence my need to go back and read. As soon as I can, I'll come back at you.
You can also get more info on this in your Help and support and typing in Partition.
This might prove useful.
I would also suggest that you consider checking with HAL9000 on this. :)
There is a very good chance that he could walk you through this.
In any case, I'll get back to you.
Good luck
Regards
Aaron

Bill,
You've got some great replies so far. Just thought I might add some things to think about.
1. Defrag C: before doing any partition merges.
Then copy/move the D: files for safekeeping.
2. If you give -all- of D:'s space to the old C: drive (ie 'delete D:partition), all your other drive letters will change - keep that in mind because some programs on E:, F, and G may need 'Path' information to run. They may not run due to old E: is now D;, old F now E, and old G is now F.
3. You may want to -keep- the D partition, but resize it to really-really small.

Just my 2 cents. Chuck

Merge partitions have many ways,such as by the professional partition software can get much help.
MiniTool Partition Wizard can do the merge partition well.maybe you can have a try.

There is many ways to merge partitions, such as by the professional partition software can get much help.
The MiniTool Partition Wizard can merge partition well

i found a free partition tool that can merge partitions on donwload.cnet
Check here: http://download.cnet.com/Easeus-Partition-Master-Home-Edition/3000-2248_4-10863346.html#editorsreview

Hey, a lot of softwares can do one-click merge partition work.
Like partition wizard and partition master.
But I prefer EASEUS PARTITION MASTER more than PARTITION WIZARD, for it is much more stable and safe as my own experience.
Here is the link for more information of one click merge feature:http://partition-tool.com/easeus-partition-manager/merge-partition.htm
Hope I can help!