How do I free up space on my computer's D drive

Try a different blank DVD, 0 space means that is something written on that CD.

Click Start, then Computer. It will show you how much free space you have on your C: drive. All "hard drives" need at least 25% free space to operate efficiently.
Run CCleaner and see how much space it frees up.
If the C drive is still short on space, you will need to uninstall any programs you no longer need, and delete any files you no longer need.

Upgrade the memory and the problem will be solved. Please let me know your laptop's model. You can use other computer to check the replacement memory here: http://www.crucial.com

HARD DISK MAINTENANCE TO KEEP COMPUTER RUNNING EFFICIENTLY.

Hard disk maintenance should be carried once a month to make your computer run efficiently.
This removes redundant and temporary files, recovers disk space and speed up hard disk access.
Disk Cleanup should be done first - Click My Computer - then right click on the C drive then click Properties, then click Disk Cleanup - let it examine the C drive then it will calculate the amount of disk space it will recover, tick all the boxes to recover the maximum disk space and then Click OK and then Yes to perform these actions. If you have a D drive then repeat these steps on this drive too.
Next the C drive needs to be Defrag. This process converts fragmented files into continuous files and this speeds up disk access and makes the hard disk not work as hard. Click on Start - All Programs - Accessories - System Tools - Disk Defragmenter - click to highlight the C drive and click Analyse - then click Defragment.
When this is completed repeat these steps for the D Drive if you have a D drive.
Disk Cleanup and Defrag can take a long time to complete, especially if these tasks have not been for a long time.

If you have low memory (RAM) then install more RAM.
If you have low memory (hard disk space) the delete unwanted data files and uninstall unwanted programs.
ALSO
Carry out HARD DISK MAINTENANCE
Hard disk maintenance should be carried once a month to make your computer run efficiently. This removes redundant and temporary files, recovers disk space and speed up hard disk access. Disk Cleanup should be done first - Click My Computer - then right click on the C drive then click Properties, then click Disk Cleanup - let it examine the C drive then it will calculate the amount of disk space it will recover, tick all the boxes to recover the maximum disk space and then Click OK and then Yes to perform these actions. If you have a D drive then repeat these steps on this drive too. Next the C drive needs to be Defrag. This process converts fragmented files into continuous files and this speeds up disk access and makes the hard disk not work as hard. Click on Start - All Programs - Accessories - System Tools - Disk Defragmenter - click to highlight the C drive and click Analyse - then click Defragment. When this is completed repeat these steps for the D Drive if you have a D drive. Disk Cleanup and Defrag can take a long time to complete, especially if these tasks have not been for a long time.

You need to delete items to free up space. Not much else, but maybe run a defrag and disk cleanup.

windows - start - control panel - administration - computer administration - hard drive administration - resize your C drive to bigger capacity, but first resize D drive to smaller capacity to free a space for C drive enlarge, then apply setting, reboot, my computer drive C right click - propertis- service - defragmentation and same operation and chek it for errors

2Gb hard drive is no good for storage or much else its very small best off changing it to a much bigger one 120GB or 250GB to be honest this will solve the problem

uninstall & delete any unused programs. Empty the recycle bin,run disk clean-up from system tools. Defragment the drive. If that doesn't help,I'd start looking into a new hard drive.

so you may have 2 situations, a real low disk space or a hidden folders to be internet server.

You can uninstall all programs outside of windows op system, like games, music, movies, some demo software, old programs not used,...