How to enable TPM

enable it from bios.google it you can get solution

Welcome to the Dell Community @shanmukha 

Sorry to say but most Inspiron's did not come with the TPM option.

So @Gihan92 going into the BIOS to enable it is a good guess but is incorrect.

Dell systems that can upgrade from TPM version 1.2 to 2.0:

https://www.dell.com/support/kbdoc/en-us/000132583/dell-systems-that-can-upgrade-from-tpm-version-1-...

Windows 11 Supported Intel Processors: 

https://docs.microsoft.com/en-us/windows-hardware/design/minimum/supported/windows-11-supported-inte...

Best regards,

U2

Compatible TPM if it has one on this model will Be Intel® Platform Trust Technology (Intel® PTT)

Hardware based TPM is not an option on consumer laptops.

This means you will NOT FIND anything that says TPM in Bios.

Go into bios and check for INTEL PTT

Intel PTT is basically the BIOS/CPU alternative to a the hardware based TPM. Intel PTT works on pretty much every processor/chipset since 4th Gen Core (Haswell) processors were introduced and it even supports Bit locker

1. Tap the F2 key when the Dell logo appears to enter the BIOS
2. Expand the "Security" section, click "PTT Security", and deselect Intel Platform Trust Technology
   NOTE: If PTT is greyed out as well, re-enable PTT by disabling Intel Trusted Execution under Virtualization Support.
   
    
   
   
   
3. Click Apply and Exit to reboot