Dell OptiPlex GX260 Series System User's Manual page 181

Adjust the Windows® display settings
Windows XP
1. Click the Start button, and then click Control Panel.
2. Click Appearance and Themes.
3. Click Display, and then click the Settings tab.
4. Try different settings for Screen resolution and Color quality.
Windows 98, 2000, and Windows NT®
1. Click the Start button, point to Settings, and then click Control Panel.
2. Double-click the Display icon, and then click the Settings tab.
3. Try different settings for Screen area or Desktop area.
Check for interrupt request conflicts—
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See "Resolving Software and Hardware Incompatibilities."