W2008 - C Drive almost out of space - options?

There are two ways to do this. One is like Knox suggested; using a third party disk partitioning product. The other is to move the data on the E, F and J partitions to another logical disk (another raid array or maybe a temporary external device) if you have one. After moving the data, delete partitions for drives E,F and J then extend the C drive (I suggest 80GB) and if you need to, set things back to the way you want them to be.

Using the Windows drive manager there is no way that I'm aware of to extend the C drive without first removing the other partitions.

Other people will suggest resizing partition software, which you may find useful. I don't have the details. However, a quick fix is to move your swap file (paging file) from the default C drive to one of your other volumes on the same disk. Right mouse click on My Computer, and pick properites. Then Advanced System Settings, and then select Performance Settings. Then on the advanced tab, you should see already checked by default "Automatically manage..." Set the C drive to No paging File and then set one of the other drive letters to System Managed. Well, one of the other drives that has plenty of room.

This will probably save the amount of physical RAM that you have, which will give you some breathing room.

I have done this several times on computers where they started life with a too small 20 Gigabytes C drive, generally freeing up about 4 GB.