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In order for you to upgrade the processor in your Laptop your best support is with your system manufacturer, you computer manufacturer determines the possibility for a processor upgrade or not. In fact, some laptops have non-replaceable soldered-in CPUs. Laptops are far more picky than desktop PCs about such upgrades.
The problem is that laptop motherboards are generally only compatible with a very specific set of processors, and if it's an old laptop, you'll not only have a hard time finding better processors, but you might not even be able to find any processors at all for it.
At this point, I strongly recommend contacting your computer manufacturer for better support, if you provide us with your computer model I can post here the link where you can contact your system manufacturer.