Icons, type suddenly reduced in size

If EVERYTHING has suddenly gotten smaller, my first guess would be your screen resolution has accidentally gotten changed.

I'm not sure what you mean by "administrative register". Unless someone else knows what this problem is, I would suspect malware.

You can "biggefy" your display on Windows XP by holding down the Ctrl key and using the plus key or the mouse's scroll wheel to return it to its usual size. (It's very easy to shrink the display without knowing what you did so you can undo it.)

I don't have any experience with administration register. Does your computer have more than one user account? Usually the one with the authority to add or delete programs is a separate account called Administrator, and all other users have separate accounts with their own passwords. However, it's also possible to set up your computer with only one account, so the administrator is also the sole user, or so all the users are on the administrator account.

If you can reproduce one or more of these administrator messages, maybe someone far more technically adept than I can give you a hand.

Maryn, half-helpful

In XP you can right click on empty space, click on properties (which will give you Display Settings) click on settings, and adjust your resolution, which will affect icon sizes.

Don't know about the admin thing.

I'm glad it turned out to be a simple solution.