From: http://forums.peachtreeusers.com/archive/index.php/t-15827.html

Permissions problem for c:\windows
NOT: just picked incorrect answers for install

Note: Pxxxx150.ini is the INI file for classified Peachtree Accounting 2008. The Pxxxx segment should be replaced with:
PFA (Peachtree First Accounting)
PAW (Pro Accounting)
PCW (Complete Accounting)
PPA (Premium Accounting)
PPAC (Premium Accounting – Construction)
PPAM (Premium Accounting – Manufacturing)
PPAD (Premium Accounting – Distribution)
PPAA (Peachtree Premium – Accountants’ Edition)
PTX (Peachtree Quantum)
PTXA (Peachtree Quantum – Accountants’ Edition)