You'll probably need to provide a bit more information? What desktop, what motherboard, what exactly are you trying to do?Why can I not fit a new mother board to my desktop
If it's upgrading an existing desktop to one with a motherboard that is compatible with Windows 11 then that will probably cost almost as much as just buying a new Windows 11 compatible PC with the added fun of the chance of things going wrong if you're not accustomed to building PCs.
After all the motherboard (plus CPU + cooler + RAM + SSD etc.) is the bulk of a PC other than, say, the power supply, GPU (if applicable), etc.
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