When i get an im, it's wider than my screen, how do i change the size of the window before it pops up?

i know how to change the size after it pops up, but the window is at least 4 times larger than my screen. this makes it impossible to have more than one im on the screen at a time...very inconvenient.When i get an im, it's wider than my screen, how do i change the size of the window before it pops up?
Countless people have been having this problem!



Copied and pasted from Yahoo Messenger Help:



Why do I receive an error when running Yahoo! Messenger?

Best guess? You might have a corrupt file in your Yahoo! Messenger directory. To fix the problem, you must manually delete the Messenger directory on your C: drive (default), then reinstall the Yahoo! Messenger application.



To delete the directory:



Close the Yahoo! Messenger application if you currently have it running. Make sure all instances of Internet Explorer are closed.

Go to your desktop and double-click ';My Computer.';

Click the ';C:'; drive.

Go to:

C:\Program Files\Yahoo!

Highlight the Yahoo! Messenger folder and press the Delete key on your keyboard. (All archives will be deleted if they are not copied. Please see below.)

To install:



Close all running applications except for your Internet browser.

Visit the Yahoo! Messenger home page.

Click the ';Download Now'; button.

To copy your complete Message Archive:



Close Yahoo! Messenger (if it is currently running).

Go to your Desktop and double-click ';My Computer.';

Select the ';C:'; drive.

Go to:

C:\Program Files\Yahoo!\Messenger\Profiles.

Your ';Profiles'; folder contains your complete Message Archive. Copy it to the same location on another computer if you wish to view it elsewhere.

Note: If you copy this folder to another computer, your complete Message Archive will be copied, overriding the Message Archive on the computer to which you are copying.

http://help.yahoo.com/l/us/yahoo/messeng



To re-install Yahoo Messenger:

Yahoo Messenger for Windows 8.1:

http://messenger.yahoo.com



Yahoo Messenger for Vista:

http://messenger.yahoo.com/windowsvista.



If the download above did not work and none of the other answers solved your problem, here is a link to Yahoo! Messenger 8 Help Form:

http://help.yahoo.com/l/us/yahoo/messeng



IMPORTANT: If all of the above does NOT answer your question or solve your problem, here is a link to Yahoo! Messenger 8 Help Form:

http://help.yahoo.com/l/us/yahoo/messeng



For future reference, please note there is a link to Yahoo Messenger Help at the very top of your Yahoo Messenger!