Hi,
With critical errors these are most likely bad files or corrupted ones within Valorant.
If you can try the following steps below to see if they can help you:
Reboot your PC
Update your GPU drivers (Search for the latest on GeForce experience, and also google for your specific GPU)
Press Ctrl + R at the same time, type in services.msc then search for the VGC service.
Right click it and select properties then make sure its set to auto run/automatic.
Find the "VALORANT-Win64-Shipping" file usually located in C:/ Riot Games > VALORANT > live > ShooterGame > Binaries > Win64 path. and then make sure it is set to admin privileges.
If none of that works try completely uninstalling Valorant, Vanguard, also go to your C program files and delete anything RIOT related. Then restart and install Valorant again.
If it still doesnt work, you can try DDU (Completely wiping your GPU drivers and reinstalling them), there is a guide online on how to do so, installing the latest BIOS version, along with any newer drivers on your MOBO compatibility section.
Hope this helps have a nice day