It depends on many things.
Generally speaking, yes, you change the entire computer.
Tell me what you have and I can provide a much better answer.
Do you have a laptop or a desktop?
What is the model number and the manufacturer?
Is it a laptop or a desktop?
What is the complete processor model number?
What operating system?
If a desktop, do you know if you have an available PCIe x16 slot?
Provide as much information as you can.
my computer is a laptop, the manufaturing is "dell" and it ID is: 2C820870-FC86-4D75-BDB7-6BB30A58F233, it processator is an intel(R) core(TM)2 Duo CPU T6600 @ 2,20GHz 2,20 GHz, and it operating system is a 64-bit operating system, x 64-based processor
This is your processor: https://ark.intel.com/products/37255/Intel-Core2-Duo-Processor-T6600-2M-Cache-2_20-GHz-800-MHz-FSB Intel® Core™2 Duo Processor T6600 (2M Cache, 2.20 GHz, 800 MHz FSB) Product Specifications
It is 9 years old.
Actually, I have one with a T7600.
Are you running Windows 7, 8, 8.1, or 10?
And, what model is your dell? Inspiron xxxx , latitude xxxx, etc?
And, how much memory do you have?
At this point, there is not much you can do with such an old laptop except to take it to a recycle facility. Then, get a new laptop.
Ok, from all that we know, you have a 9-year old Dell laptop, with 4GB memory, and 64-bit Windows 10.
It is time to get a new laptop (or desktop).
There is nothing that can be done to make your laptop any better.