Desktop icons ghosted and invisbles showing

Yesterday I accidentally opened Terminal and didn't realize it until after I typed into it and hit a few returns. I thought nothing of it until today. When I started up all of the desktop icons were ghosted or transparent. The Dock apps look fine, and everything seems to work OK. There are odd .DS_Store files everywhere and other files that start with a dot that I've heard are supposed to be invisible.

I've looked around and found out that it's a Finder problem that can be corrected by typing something into Terminal. That's how I realized I must have messed it up yesterday when I accidentally typed into the Terminal.

Can someone please tell me what code I need to enter into Terminal to restore it to the default settings.

I have a Dual 2.7 GHz PowerPC G5 with OS 10.4.11, and other than this problem it works great.

Thanks in advance.