Can I add or must I replace the HD on my HP Pavilion 724C with a Solid State Drive?
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You can probably add one if your computer has extra SATA connections; but to get your operating system on the SSD you will have to reinstall it; this will cause you to lose all your data unless you back it up.
Open your pc case and take a look. See of there is an extra drive bay and an extra SATA 2 or SATA 3 connection on the motherboard.
Here is a link to the official HP "how to" page for installing or replacing a drive in the HP724c desktop pc: