2010 apple computer disk

That will probably be quite difficult.

First, you'd need to know exactly which version of (presumably) Snow Leopard yours came with. You can try this site:

https://everymac.com/systems/apple/imac/specs/imac-core-i3-3.2-21-inch-aluminum-mid-2010-specs.html

If yours came with a version older than 10.6.3, there are full update 10.6.3 install disks you can find at various places and those can be used for an erase and install. If it came with something newer than 10.6.3, then you have a problem.

Be very careful ordering disks. As I said, the 10.6.3 disks could work, but the install diaka in those days were build specific for a certain build on a machine and would only workmon that machine.

Here is one with 10.6.3

https://www.ebay.com/itm/115502378506?hash=item1ae47a6e0a:g:g5AAAOSwO2Ji-u8h