Question 1. User PC requirements for Costco Online Photo Center Windows XP Windows Vista must be installed with over 500MB of remaining hard drive space. Question 2. Active X program download & installation for first time users. Costco's online order program consists of Active X. First time users may experience waiting time  1~2 minutes to download & install this program. Question 3. Order size capacity. When ordering through Costco Online Photo Center Program, number of files should be less than 10,000 and under 2GB.