SSL/TLS NW 7.30 Portal issue on XP SP2

We have an odd situation after upgrading our BW landcape to NW 7.30 SPS7. When we tried SSO to the portals IE 8 browser error was "Internet Explorer cannot display the page. We resolved this on WIN 7 desktop by activating TLS 1.2. The XP Operating System does not have this as an option. Is this an issue with SAPCRYPTOLIB 555 patch 34?