ORA-27102, ORA-27100 on startup in a Windows 32bit platform

We changed parameter SGA_MAX_SIZE to 2GB in the spfile and we shutdown the database.
When we tried to startup, we got the following errors:

SQL*Plus: Release 10.2.0.1.0 - Production on Sun Nov 6 15:24:45 2011
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to an idle instance.
SQL> startup
ORA-27102: out of memory
OSD-00022: additional error information
O/S-Error: (OS 8) Not enough storage is available to process this command.
SQL> startup
ORA-27100: shared memory realm already exists

According to Oracle Note 1080317.1 "Summary of Causes for ORA-27102 on Startup":

    If oracle version is 32bit, the maximum SGA_TARGET / SGA_MAX_SIZE is 1.75gb

To start the database, we had to:
1. Start/stop oracle service.
2. Use an older pfile, where SGA_MAX_SIZE had a valid value.

SQL*Plus: Release 10.2.0.1.0 - Production on Sun Nov 6 15:53:03 2011
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to an idle instance.
SQL> startup pfile='E:\ORACLE\product\10.2.0\db_1\database\INIToblicore.ORA'
ORACLE instance started.
Total System Global Area 1258291200 bytes
Fixed Size                  1250572 bytes
Variable Size             419433204 bytes
Database Buffers          830472192 bytes
Redo Buffers                7135232 bytes
Database mounted.
Database opened.

SQL> create spfile='E:\ORACLE\product\10.2.0\db_1\database\SPFILEOBLICORE.ORA' from pfile;
File created.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup
ORACLE instance started.
Total System Global Area 1258291200 bytes
Fixed Size                  1250572 bytes
Variable Size             419433204 bytes
Database Buffers          830472192 bytes
Redo Buffers                7135232 bytes
Database mounted.
Database opened.