Disable bios memory options caching shadowing

Please do not do this.

i think that with f10 gets you into bios, check what offers because the bios of laptop is very typical you dont have many choices as desktop bios.

hope this will help

you need to get the os reinstalled.

it's about the processor level caches
but also might be a bad memory slot (RAM)

resetting the bios is a good choice, maybe this will helpe either

If you are using an AGP or PCI graphic card try disabling the on board video adapter from BIOS.

Ensure that you have the latest drivers for this video card installed.

If the video adapter is using shared memory, then you may have a faulty RAM module.

Reinstall Direct X and any graphic acceleration software.

Go to BIOS and disable memory caching and shadowing options, this usually does not solve the problem, but you never know.

Contact video card or Motherboard manufacturer, there may be an issue between video adapter and your motherboard, or the specific software that you are using. In that case manufacturer may require to download a patch.

This particular error would typically indicate a problem with memory mapping associated with a peripheral device. I was unable to locate a hit for okfu53.sys, but most likely this is a device driver of some type. The instruction to disable cache is a holdover from old hardware and operating systems and is most likely not actually applicable- however by disabling it is just two areas that are memory users that you don't need at that point. Frankly I would just reboot. If you see it again reinstall the video drivers.

Since it is a Toshiba Tecra if you are not worried about losing data on the laptop you can try turning on the laptop and start pressing the zero key. It should give you the option to restore your laptop if you haven't deleted the restore partition on the laptop.

Nine times out off ten this message is caused by defective memory. If you have more than one stick in the computer, pull them and test them one at a time until the problem triggers again.
Try taking the computer into Safe Mode and see if you still get the message. If you do, then its DEFINITELY the memory.

try pressing F2 and DEL key rapidly after switch on until you get a BIOS or password request