Here are the scenarios.

Scenario A.
- If I re-install Windows XP Pro on a clean computer**, the configuration of which meets al the requirement for Windows XP Pro installation,
- without SP2, SP3, or any new XP updates.
- after installation would I be able to check for these updates.
** with valid Key, etc.

Scenario B.
Or, -
- After installation of XP,
- I install SP1, SP2, and SP3 (which are still available on Microsoft's official download site),
- would I be able to check and update all the other updates?

Microsoft states that there would not be any updates to XP and ends the XP Support on April 8. But would that mean that Microsoft won'tallow any more access to SP1, SP2, SP3, and I cannot get my XP update even that they were available before April 8?