Windows XP SP3 and above
Windows Server 2003 SP2 and above
Qualys Cloud Platform certification uses SHA2-512. Windows XP and Windows Server 2003 do not include SHA2 support by default so you must install a SHA2 hotfix on these systems, otherwise certification will fail.
Cloud Agent Platform Windows Hotfixes
Microsoft KB Article on SHA-256 Support
Microsoft Developer Troubleshooting help