PostgreSQL 9 install on Windows: “Unable to write inside TEMP environment path.”

Question

I am attempting to install PostgreSQL 9 (postgresql-9.0.3-1-windows.exe) on my WinXP machine and get the following error at the start:

Answer 1

I had this issue when trying to install the 32 bit version on Windows 7 64 bit.

Trying the install kit for 64 bit presented no errors, but the solutions presented by others are also valid.