screen resolution difficulty

i am completely new to Linux.  i just installed Linux-Mandrake 6.1 on a partition of my hard drive.  the installation was problem-free.  however, in Windows 98 i have grown accustomed to a 1024 x 768 resolution.  X windows seems to have a 640 x 480, and i cannot find in any of the settings any way to change that. how can i change the screen resolution?
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laeuchliConnect With a Mentor Commented:
Type in XF86Setup, and choose a new res. If that does not help, then you have the wrong graphics driver.
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