The blog of Windows Wally, a Windows Support Technician helping common people solve frustrating computer problems.


Reader Question:
“Hi Wally, My computer’s doing weird things since the video card was changed. Now, its showing a blue screen with agp_invalid_access and error code STOP 0×00000104.“ - Diana B., USA

Before addressing any computer issue, I always recommend scanning and repairing any underlying problems affecting your PC health and performance:

  • Step 1 : Download PC Repair & Optimizer Tool (WinThruster for Win 10, 8, 7, Vista, XP and 2000 – Microsoft Gold Certified).
  • Step 2 : Click “Start Scan” to find Windows registry issues that could be causing PC problems.
  • Step 3 : Click “Repair All” to fix all issues.

Setting up weekly (or daily) automatic scans will help prevent system problems and keep your PC running fast and trouble-free.

Wally’s Answer: This error usually appears due to problems in the BIOS or an invalid video driver. It causes the computer to crash after showing a blue screen with a STOP 0×00000104 error code. The computer is restarted to protect Windows and the computer from potential damage. Here we will look at some ways to fix the agp_invalid_access error.


Windows crashes when this error appears on the screen. It is known as agp_invalid_access and STOP 0×00000104.


  • The agp_invalid_access occurs due to a problem in the computer’s GPU. The GPU (Graphical Processing Unit) helps produce the images you see on your computer screen.
  • This error can also sometimes appear when the BIOS (Basic Input / Output System) of the computer is outdated.


Here are some ways to deal with the agp_invalid_access error.

Check For Compatibility Issues Between Your Video Card And Driver

This error is almost always related to the video card driver. Fixing this will require you to check compatibility between the driver, and the video card. This can be done by checking information about your video card by going to the manufacturer’s website or by reading the information on the video card’s manual. It might not have been designed for your computer’s motherboard.

Update The Device Driver To Fix The Agp_invalid_access Error

Check the make and model of the video card and go to the manufacturer’s website. Once you get to the video card driver’s website, you will need to download and install the driver.

You can also use utility software to automatically find, download, and install the device driver for you. DriverDoc is a reliable driver utility that can be used to do this easily. It will also notify you when updates to those drivers are available for download.

In Case Of BIOS Error Due To Faulty Hardware

If the version of BIOS of the computer is outdated then it can also lead to an agp_invalid_access error to appear. This error can be fixed easily by going to your computer manufacturer’s website and finding the latest version of BIOS firmware. BIOS firmware is basically the BIOS driver and its installation is also the same as any other device driver.

Although this advice goes for installing all drivers, make sure that the computer does not restart unexpectedly while this driver is being installed in particular. This is because firmware upgrades are hardware-based and problems in installing the driver can be serious. BIOS drivers are updated very rarely and usually only when a problem like this occurs.

I Hope You Liked This Blog Article! If You Need Additional Support on This Issue Then Please Don’t Hesitate To Contact Me On Facebook.

Is Your PC Healthy?

I always recommend to my readers to regularly use a trusted registry cleaner and optimizer such as WinThruster or CCleaner. Many problems that you encounter can be attributed to a corrupt and bloated registry.

Happy Computing! :)

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About the Author

Windows Wally is a helpful guy. It’s just in his nature. It’s why he started a blog in the first place. He heard over and over how hard it was to find simple, plain-English solutions to Windows troubleshooting problems on the Internet. Enter: Windows Wally. Ask away, and he will answer.