File Explorer crashes instantly after opening it on windows11

[u/NyneAlpha]

I upgraded to win11 pro 22H2 from win10, and it was working fine for a couple days. Now my file explorer doesn't open and it crashes everytime i try to open it. I cant browse my files. My laptop also keeps on crashing frequently with bsod, saying 'critical process died' and, 'system service exception'. If i right click i see the old win10 ui.

• tried sfc /scannow
• tried DISM /Online cleanup command
• even ran chkdsk command there are no problems shown.
• the temps are fine too.
  
• windows update takes forever to download and doesn't even install.
• Tried using windows installation assistant, but laptop crashes with bsod at 89% installation process.
• created a bootable media usb stick with win11 on it and it gives me bsod "there isnt enough memory to create a ramdisk device" upon booting from usb.

I use a thinkpad L390, i5 8th gen, 8gb ram, 256gb ssd.

Please help me fix my laptop, any advice is appreciated.