- Be sure your internet browser is up-to-date, as well as try different browsers.

- You'll need your computer's processor speed to be at least 1 GHz (this will be displayed on the System tab of your DirectX Diagnostic Tool).

- Be sure your Microsoft DirectX is up-to-date with the current runtimes; the installation package in that link applies to Windows 7/Vista/XP and will update any version of DirectX that you have, be it 11, 10, 9, etc. Note that the DirectX Runtime (Direct3D, DirectInput, DirectSound) is not part of this installation package as it is included as part of the Windows operating system, and therefore cannot be installed or uninstalled. Updating the DirectX Runtime is achieved by installing the latest Windows Service Pack. Updating your DirectX will make sure that your computer is compatible with some of the more recent graphics plugins. More info on the different versions of DirectX can be found here: http://en.wikipedia.org/wiki/DirectX

- Run the DirectX Diagnostic Tool and correct any issues it finds; click the Help button on the Diagnostic Tool for details on how to diagnose problems.
Instructions for this -

Windows 7 - http://windows.microsoft.com/en-US/windows7/Diagnosing-basic-problems-with-DirectX

Vista - http://windows.microsoft.com/en-US/windows-vista/Run-DirectX-Diagnostic-Tool

XP - http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/troubleshooting_directx.mspx?mfr=true
Hardware acceleration in XP:

Open your Start menu; then Control Panel; then Display; on the Display Properties box click the Settings tab; click the Advanced button; on that box click the Troubleshoot tab; on that box you'll see Hardware acceleration. Slide this to max.

- If you have some type of Radeon or GeForce graphic card then you'll have the highest probability of the N64 ROMs being fully playable. Although I'm certain you can play the ROMs with various graphic cards, I'm not sure of the compatibility of each card. However, in some cases your graphic card's driver may just need to be updated. You can typically update the driver from the manufacturer's site, or from Windows Updates via the link Find hardware support (while using Internet Explorer).

The simplest way to update the driver is from the Windows Update Web Site. Instructions for this -

- If you have Windows 7, http://windows.microsoft.com/en-US/windows7/Install-Windows-updates, on this page click the link that says To install drivers and other optional updates

- If you have Vista, http://windows.microsoft.com/en-US/windows-vista/Install-Windows-updates, on this page click the link that says To install drivers and other optional updates

- If you have XP, you'll click the Start button, then Control Panel, then Automatic Updates, then on that box you'll click the link that says Windows Update Web Site. Then click the Custom button on the page that opens, and the update for the driver will be in the Hardware updates list,