it will crash under XP

It will crash.

OS: XP sp3
Antivirus: bitdefender 2015
version:4.1

When I use "Paste the links" function, the software starts to analyze list of links, and suddenly shows a
window that tell me it has crashed.
But If I use the earlier version 3.6, the software works fine.
I think it crashed may due to the Antivirus and firewall.
But the crash still happens after I turn off the Antivirus and firewall.