See what default printer you have in Control Panel, Devices and Printers. Look at the printer with the green check mark and see what paper it is set to. Change that to A4.
If you have no printer driver installed, I don't have a cure for that one.
Bob
Hi Everyone
This is a annoying problem all of a sudden Wordpad as decided to change the size of my Wordpad documents when I open them I have gone into page set up and changed it back to A4 but it changes back when I reopen it this happens with all my wordpad documents now.They open very slimmed down to about 3 and half inch page can anyone help.
Steve

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic