If this article does not describe your hardware-related issue, please see the following Microsoft Web site to view more articles about hardware:
If you have multiple monitors connected to your computer, you may be unable to drag a window from one screen to another.
This behavior can occur if the window you are trying to drag is maximized, or your monitors are not positioned correctly.
To work around this behavior, use the appropriate method:
Restore the Window Before You Drag It
Restore the window to its previous size before you drag it to a different screen. To do so, click the Restore button (the middle button in the upper-right corner of the window).
Verify Your Monitor's Position
For information about verifying your monitor's position, click Start, click Help, click the Index tab, type multiple display support, and then double-click the "arranging monitors" topic.
Windows 98 supports the use of multiple monitors to expand your desktop area. To use multiple monitors, you need a supported Peripheral Component Interconnect (PCI) or Accelerated Graphic Port (AGP) video adapter for each monitor that is connected to your computer, and DirectX 5-compliant video drivers.
NOTE: Currently, a Permedia video adapter cannot be used as your primary video adapter (excludes the Permedia NT and Permedia-2).
For information about how to use multiple monitors in Windows 98, click Start, click Help, click the Index tab, type multiple, and then double-click the "Multiple display support" topic.