no Dash, no Launcher after compizconfig - stuck !

I'm a complete novice to LINUX and Ubuntu
I have Ubuntu 11.10, run it since september
Ran Compizconfig and put icon size = 32 and a few more settings, edge, delay but also "wall"/cube (but Idon't realy know what I did there). I also changed the Ke shortcut for "Launcher" from <super> to <Alt>Tab.

Now I don't get Launcher to appear, neither Dash nor the right side top Menu with any of the small status icons or "System Setttings", Hibernate, shut down etc. (Now Alt-Tab doesn't work for switching applications either - the few that I can "trick" Ubuntu to start).

I can start "terminal" with ctrl-alt-T but I don't know really know what to do there or how to run commands in it.
Tried sudo compizconfig - but compizconfig wasn't found (I guess I'm in a directory of the user "I logged in as"
I don't know where to find applications or how to start them in the terminal window.
The "Meta key" doesn't work (the "Windows" key on a HP Compaq portable PC) tried "holding" it, META+1 etc.

Can't find a "restore to earlier settings" in UBUNTU ?

How do I revert to ealier config ? or reset , or "safe mode"...
I found a "standard config file" and "Extra ...", but I didn't dare mess ith it (if it would allow me to save an edited file I don't know).

1. I can start system settings by right clicking in the desktop, pick "change background" and then clicking "All settings").
2. I started Chromium by going to "Ubuntu Help" (The desktop menu on the left top does appear whn desktop is active - so from there I went to HELP), and then from the HELP - I wnt to "Online HELP", whuch launced chromium.
3. Since I could reach system settings I also created a new account (administrator too), which I will try.....or to log in as root (I have set the password for root)

Help much appreciated...