Thanx for the replies. But its still the same.
The first thing I did Brink, was to check that I had the Network icon turned on, and as I said, it wasn't and I am unable to turn it on as it is greyed out. This is the problem I have..I cant turn anything on or off as it says I'm not the administrator.
I took notice of Jonathan_King's comments and I have now got rid of the 2nd account, so as before, I am the only user and am the Administrator.
I also did what JK suggested re: elevated command prompt and sfc /scannow, it scanned and said that there had been a few errors which had been fixed but I lost my Internet connection and couldnt get it back at all. I was having quite a few probs so I ended up using System Restore and went back to last Wednesday, when I know the Network icone was in the systray...but it's still the same..no icon and I can't turn it on.
I'm confused now as I've now seen Alphanumeric's post saying that I SHOULD have a 2nd account.

I've only ever had one account and that was as Administrator. I only created the second account yesterday when someone on another forum said I should. But, whether I have one or two accounts, the problem still exists and was there BEFORE I created the second account. I WAS the Administrator but it wasn't letting me turn on/off the icons and still said only an administrator could do that, which I was.
The Network icon went missing from the systray on Thursday.
I'm really beginning to hate Windows 7. I only installed it last Sunday and I've had nothing but trouble since. I've not had this much trouble with any of my computer systems in the 10 years I've been using a computer, going from Windows 98, XP, Vista and now 7. I got my computer in October the day before 7 came out..yes..I know..stupid move...but Acer sent me a Windows 7 disc but I've only just found the time to install it.
I want my XP back!
Lyn