Everytime I press graph it says "ERR:WINDOW RANGE"??? It never did that before and now I always get prompted for some reason?

You will have to hit the window button on the face of the calculator that is just below the screen and change the values making sure the max value is larger than the min value.

You need to press the "window" button located at the top of the calculator, then change the Xmin,Xmax,Ymin, and Ymax to values that your graph will fit in.

There is no one good window range for all graphs, since graphs can have different areas of interest.

Press the ZOOM key, then select ZStandard. This will restore the window settings to the default range, which will at least allow the graph to be displayed. You can then change the window range and/or zoom as desired.

If this doesn't do it, please reply to this post, giving the function(s) you're trying to graph and your current window settings.

Start by pressing ZOOM (the center function key on the very top row of the keyboard, just below the display) and select 6:ZStandard. This will set the window range to the standard default. After that, you can either zoom in on an area of interest or press WINDOW (just to the left of the ZOOM key) and enter in the window range.

Press ZOOM 6 to reset the window range to their defaults. If that doesn't do it, please reply to this post specifying the exact function you're trying to graph and your window settings.

There's something wrong with your window limits, for example Xmax < Xmin or Ymax < Ymin. Press WINDOW to bring up the window editor and examine the values, making sure there are no inconsistencies.

If you don't see anything wrong, post a comment here listing all of the entries in the window editor.

Try using the standard Zoom.
If you are drawing Y=f(X) functions, press [ZOOM][6:ZStandard]. The window dimensions will be [-10, 10] for X and the same for Y.
If you are drawing polar graphs, in addition to the X,Y windows dimensions, you have Theta min =0 and Theta max =2*Pi =(6.28)

Press ZOOM and select Zoom standard (ZoomStd).
Alternatively, press the WINDOW key to access the window range setup
Set Xmin=-10
Xmax=10
Ymin=-10
Ymax=10
These are the standard dimensions of the window.
You can change the dimensions as long as Xmin is less then Xmax, and Ymin is less than Ymax. Do not make Xres close to Xmax-Xmin.

Simple:

Hit this sequence:

"ZOOM" "0"

That is for the "Zoom Fit" option. The calculator does not like the window you have for the equation you've given it. With this option, it will automatically give you the best fit in the window for the equation!

This probably means you have a statistics variable set to on in your graphing screen. Press . If you see one, or more of the plots at the top highlighted you should turn them off.
To turn them off use the  until Plot1 is highlighted. Use the  if needed to move to a highlighted plot. Press .