Why is my computer so slow?

I have an iMac Early 2008 with an Intel Core 2 Duo, 2 GB of RAM, and a 256 MB Radeon 2600 PRO and the computer is really slow. It’s running Windows 10 because i installed that on it but it’s really really slow it takes 10 minutes to boot (i still have the original hard drive in) and every app takes 3 minutes to... show more I have an iMac Early 2008 with an Intel Core 2 Duo, 2 GB of RAM, and a 256 MB Radeon 2600 PRO and the computer is really slow. It’s running Windows 10 because i installed that on it but it’s really really slow it takes 10 minutes to boot (i still have the original hard drive in) and every app takes 3 minutes to open and it is just SO SLOW!!!!! and every game i play is so laggy and unplayable! i don’t know why!!!!
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