I am getting a disk error, but I know I have lots of room on my hard drive.

The problem may be your disk size. DOS has trouble with disks greater than 2 gb. There are two fixes -- both work.

The fixes are:

1) '2gbfix' which is put in the autoexec file after the 'prompt' command

2) 'vCOMPAT' which goes in the config.sys.