You have one hard disk, divided in 2 partitions (c: 60 GB and d: 400 GB). That one disk is sold to you as a 500 GB hard disk. That's the usual 7% difference. Not an issue it all.
Now the 2 questions are:
- Why did Dell make these 2 partitions on the disk?
- Why do you use only and not the other? It's just as easy to make folders on the d: drive as it is to make folders on the c:-drive. And it's just as easy to save files in a folder on the d: drive as it is to save files in folders on the c:-drive. There is 396 GB for you to use there!
People who store everything in their Documents (and Pictures and so on) folders, can easily move those to another disk (in the Libraries section of Windows Explorer right click on My Documents, go to the location tab, change the c: in d: and click the Move button. You might be one of those people.
Any other folders you made yourself directly in the root folder of the c:\drive can be moved with Windows Explorer. Any new folders can be made there from now on.
You can even make a d:\Program Files folder and install most new programs there.
To answer your question: it's large because Dell made it so, and it's empty because you didn't put anything on it.
By the way, did you already use the Disk Cleanup wizard to delete temporary files and old system restore points from your c:-drive. That can easily free another 10 GB from that 60. Cleaning those old system restore points is under the advanced button. I didn't check if it's mentioned in this video: http://www.youtube.com/watch?v=Q2dSKFGFaA4 but if it isn't it's not too difficult to find and just googling DISK CLEANUP WIZARD will surely help you find and use it.
Just do it once every 6 months or so.
Alas, with 8.5 GB free on the c:-drive I'm afraid that a full hard disk
isn't the cause of your troubles with IE. But that's totally other
story.
Kees