I'll assume H Drive is:
A partition, if so then;
1. Create a new folder on your H Drive
a) To do this, Open My Computer
b) Open H Drive
c) Click File --> New --> Folder
d) Rename the folder to anything you like
2. Now, go to your C Drive
3. Select the files you want to copy, to select all press CTRL + A
4. Click on Edit --> Copy To Folder
5. A window pops up, select the new folder you created earlier
6. Click Copy
A Removable Drive, if so then:
1. Repeat instructions 1-6 from above.
A CDR/DVDR Drive, if so then (assuming you have Windows XP):
1. Repeat instructions 2-6 from above
2. Then, Open My Computer
3. Open H Drive
4. On the left pane, you should see a option that says "Write these files to CD"
5. Choose that option, make sure you have a blank CDR/DVR on your H Drive.