Check the Windows firewall and/or the hosts file in "C:\Windows\System32\drivers\etc".
The hosts file redirects domains and IPs, maybe there's an entry to redirect one or multiple of Adobe's servers to IP 127.0.0.0 (localhost).
Often malware changer your system tcpip host file to redirect ip addrress. Your "Host" file has no extension and normally is not redirecting much may look like MS default one which is all comments
# Copyright (c) 1993-2009 Microsoft Corp.
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
# For example:
# 18.104.22.168 rhino.acme.com # source server
# 22.214.171.124 x.acme.com # x client host
# localhost name resolution is handled within DNS itself.
# 127.0.0.1 localhost
# ::1 localhost
I have tried fixing the Hosts file but it didn't fix the problem. I also disabled the firewall when I tried installing PS. Any other ideas?
Try a different PC, just for verification it's not your system. In case it is, then I don't know anymore. Internet access is there, but not for the installer.