So i have updated my vegas pro and when i click render as the problem changed:

Problem Description
   Application Name:    VEGAS Pro
   Application Version: Version 18.0 (Build 373)
   Problem:             Unmanaged Exception (0xc0000005)
   Fault Module:        C:\Program Files\VEGAS\Vegas Pro 18\vegas180.exe
   Fault Address:       0x00007FF975A809F0
   Fault Offset:        0x00007FF975A809F0

Fault Process Details
   Process Path:        C:\Program Files\VEGAS\Vegas Pro 18\vegas180.exe
   Process Version:     Version 18.0 (Build 373)
   Process Description: VEGAS Pro
   Process Image Date:  2020-12-18 (Fri Dec 18) 18:43:49
 

Have you also updated the graphics card drivers? - (Help / Search for driver updates)

If so, take the next step and set under "Preferences / Video" Dynamic RAM Preview to "0" (Please only change one thing at a time so that you know what ultimately helped)

If that doesn't help either, deactivate the graphics card in the form below as a test.

i have done what you said, i have checked my drivers with iobit driver booster 8 Pro, i think i have to upgrade my windows 8.1 to windows 10, i dont want to upgrade but when i installed VP it said that my windows is not supported, should i upgrade u trie anything else?

Vegas Pro 18 requires WIN 10, some can also work with WIN 7, but Vegas has built in some new functions that only run under WIN 10.

Please check the driver update with the function built into Vegas Pro 18, because Vegas Pro 18 selects the drivers that are optimized for Vegas Pro 18 - for example: Studio (and not game) drivers at Nvidia - and also selects them in the preferences settings optimized for Vegas.

Please also check whether your PC meets the minimum requirements for Vegas Pro 18. https://www.vegascreativesoftware.com/us/vegas-pro/specifications/#productMenu
There are also users up here who are clearly designed below that, but they will soon reach their limits - and you never know where they are. Those are the mistakes where you look and look and look .....

i have all my drivers updated and when click in driver update on vegas and appear the things on the print-screen that i will send.

Edit: Also I updated my windows to windows 10.

Strange - that's clearly not OK. You could still try to reset the software to the delivery status.
Please follow the procedure exactly:
https://www.vegascreativesoftware.info/us/forum/faq-how-can-i-reset-vegas-pro-to-default-settings--104646/

And your PC meets the minimum requirements?
It is best to document your PC system and the software used in your profile under "Signature" - then it will also be available for other inquiries without always having to ask.
See my Signature for example

I did what was in the link that you send and the error continues.

My pc does not meet the specifications that you send on this link: https://www.vegascreativesoftware.com/us/vegas-pro/specifications/#productMenu

But i have always used Vegas Pro on this pc whitout that error...

Recently in my ASUS ROG, I have to start with empty project first (cancel loading previous project) and put media generator anything (checkerboard), then do File>Render as... in order to make the render dialog box appear.

Then after that, open the previous project, proceed.

Not sure the solution may the same to you, but works on my system via this way.

I have done that and also i have used iobit uninstaller for a powerful uninstall to vegas, i installed again and keep the same error..

@Fernando
I think I can't help you any more.
Maybe others know something else.

I did what was in the link that you send and the error continues.

My pc does not meet the specifications that you send on this link: https://www.vegascreativesoftware.com/us/vegas-pro/specifications/#productMenu

But i have always used Vegas Pro on this pc whitout that error...

When you say does not meet the specifications, in what way?
GPU? Perhaps disable GPU in preferences if you haven't already.

From your computer specs listed under your signature, your computer is unfortunately inadequate to successfully run all functions of Vegas Pro 18 no matter what build. Your CPU is a Celeron from 2014 which is a low-end CPU aimed at low-cost low performance laptops. Earlier versions of Vegas Pro may have worked on your computer in the past, but as programs like Vegas Pro evolve, computer requirements update as well which often require current day technology.

If you want to fully use Vegas Pro 18, it's time to think about updating your computer to current day computer technology. If not, the other option is to continue using earlier versions of Vegas Pro that do function on your existing computer.

From your computer specs listed under your signature, your computer is unfortunately inadequate to successfully run all functions of Vegas Pro 18 no matter what build. Your CPU is a Celeron from 2014 which is a low-end CPU aimed at low-cost low performance laptops. Earlier versions of Vegas Pro may have worked on your computer in the past, but as programs like Vegas Pro evolve, computer requirements update as well which often require current day technology.

If you want to fully use Vegas Pro 18, it's time to think about updating your computer to current day computer technology. If not, the other option is to continue using earlier versions of Vegas Pro that do function on your existing computer.

Yes i will use the earlier versions, because the error start occurring with the version 18..

about the specs, i want to build a great computer but the covid-19 have burned my plans

thanks for everyone that wasted his time to tried to help me, i appreciate that a lot.