File Permissions / root

[Ray Canzius]

Gday All,


My problem is that although I have logged in and am the only person
using computer, and I also installed software, when it asked for
name,id,passwords etc I put myself as user (nobody else), I have looked
at viewing and changing files. Every time I try to write file to hard
drive  it tells me I do not have permission, when I look at who is the
owner of file(s) it tells me that the owner is root. 

OK, what have I done wrong, has there anything I may have missed at
install, and how do I change this ?

Regards
	Ray