windows xp

[stian]

hi
im having a small problem, can anyone help? when i run
two or more programs at the same time I can't change
between then by pressing their Icons at the bottom of the
page. I've always done that until yesterday, and now I
don't know how to get it back to normal. The icons starts
flashing red, but the program does not come in front.
Thanx for all help!