Having had to buy a new PC ( I already hate Windows 8 ) Ihave a probably very simple question.

The hard drive was advertised as being 1 TB, but Explorer tells me I have a 500GB C drive and a ' D Data drive' of 500GB.

What's the difference ? Can I only save files onto the D Drive ? Can I only install programs on the C Drive ? And which bits is the Cloud trying to copy ? Should I move all of my files onto the D Drive or will I never get them back again ?

And what's this thing people call the Internet ?