For WinXP, edit the boot.ini file in C:\ to add a /3GB switch - see https://support.microsoft.com/en-us/kb/316739 for details. Windows will need to be restarted for this to take effect.
Also consider adding /userva=2900 after the /3GB - this will reduce available memory slightly from 3072 to 2900 but should avoid potential issues with reduced Windows kernel memory as noted in the MS article.
Windows 32-bit: Crashing occasionally or on specific area transitions
in Pillars of Eternity Support Blog
A blog by Darren Monahan in General
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For WinXP, edit the boot.ini file in C:\ to add a /3GB switch - see https://support.microsoft.com/en-us/kb/316739 for details. Windows will need to be restarted for this to take effect.
Also consider adding /userva=2900 after the /3GB - this will reduce available memory slightly from 3072 to 2900 but should avoid potential issues with reduced Windows kernel memory as noted in the MS article.