It sounds like you're dealing with a laptop that's nearing the end of its useful life, especially given the performance issues with the A10-4655 APU, the lack of TPM for Windows 11 compatibility, and the recurring disk errors. Replacing the hard drive with an SSD could significantly improve the laptop's performance and extend its usability until its end of life in 2025, but given the potential challenges with the hard drive replacement process and the laptop's overall limitations, it might be worth discussing with the owner whether it's better to invest in a new machine now rather than patching up an aging system. If you do proceed with the SSD replacement, it could be a good weekend project that should help with the current performance issues, but it's also important to weigh this against the possibility of other components failing as the laptop continues to age.