[Crash] Defiled Crypt Portal

I had clear all the way up to the Cemetery of the Forsaken, then I entered the first Defiled Crypt (the one that is at the bottom to the left) and cleared it as well, when I clicked the portal to enter the second Defiled Crypt (the one that is at the top to the left) the client crashed and I got this error id: 4C2BBA40-C8A8-4F21-B318-BDA35EFF9142

When I logged back in I was at the entrance of the Defiled Crypt but all the map that I had cleared was dark again, even the gate that I had to open to get into the Cemetery of the Forsaken was closed, I had to destroy the lock again and going my way back I encountered all the mobs that I had killed moments before.

I was solo playing with a male Barbarian, couldn't reproduce the crash and unfortunately I don't have a screenshot of the error.

My system specifications are this:
Operating System:
Windows 2.5.1.2600 (Service Pack 3)
CPU Type:
Pentium® Dual-Core CPU E5200 @ 2.50GHz
CPU Speed:
2.54 GHz
System Memory:
2 GB
Video Card Model:
ATI Radeon HD 4350
Video Card Memory:
1.11 GB
Video Card Driver:
ati2dvag.dll
Desktop Resolution:
1360x768
Hard Disk Size:
298.08 GB
Hard Disk Free Space:
39.61 GB (13%)
Download Speed:
1.02 MB/s (8.6 mbps)