UE3 - UT3 Crash while loading map

When I make a map, I don't like the repetition involved, so I use quite a bit of prefabs to make things faster. It works quite well, and, actually, saves alot of time.

However, just today when I boot up my PC after restarting it and hoping to get back on yesterdays work on a map I had just started, the editor crashes while loading for unknown reasons.

Then, I thought this could be related to the fact that I saved the prefabs I made, so, I deleted the custom environment files, and, viola, the map opens with all the actors (prefabs) missing. This simply can not do!

So, have any idea how to fix this?

Error is as shown:



Downloaded UT3 from Direct2Drive; patch 1.3 installed.

SPECS:

Windows Vista (home premium)
NVIDIA GeForce 9600 GT
2 gigs of RAM
Running AVG antivirus
Intel Pentium dual core 1.8 GHz

(using subtractive map)

I'm having additional problems. The editor seems to now be spontaneously crashing on a seemingly random occurrence when loading environment files.

Thanks, that fixed it.