Can't see this related at all to the RAM.
Try this from an "elevated command prompt" as I find this often solves odd site access issues.
Type cmd.exe in to the run box and then right click cmd.exe and select run as admin.
Then type exactly noting spaces, ipconfig /flushdns and press enter.
This will flush the DNS cache.
Then type, net stop dnscache and press enter.
Then type, net start dnscache and press enter.
Close the window and see if OK