The following bug has been logged online:

Bug reference: 1863
Logged by: Howard Brodale
Email address: brodhow (AT) all2easy (DOT) net
PostgreSQL version: 8.03
Operating system: Win 98 2nd ed
Description: Install won't work
Details:

postgresql-8.0, 56kb Wndows Installation 5/12/05 9:14AM bombs with a popup
window displaying "Failed to create process: 2!" right after the language
selection window.

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TIP 3: Have you checked our extensive FAQ?

http://www.postgresql.org/docs/faq

Howard Brodale wrote:
I don't believe win Me/98/95/3.1 are supported for PostgreSQL. Windows
2000 and on should be fine though.

If you really need to run PG on Win98, perhaps take a look at the cygwin
project and see about installing via that route.

--
Richard Huxton
Archonet Ltd

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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match