Acrobat Reader 4.0.5 system requirements

i486 processor (Pentium recommended)
Microsoft Windows 95, Windows 98, or Windows NT 4.0 with Service Pack 3 or later (English language versions only)
8MB of RAM on Windows 95 and Windows 98 (16MB recommended)
16MB of RAM on Windows NT (24MB recommended)
10MB of available hard-disk space
Internet Explorer 5.0
Netscape Navigator 4.5 to 4.77, 6.1
America Online 6.0