This is a pretty easy one ... just read the Error-message
What is this Error ? Well, here's the doc :
http://docs.oracle.com/javase/8/docs/api/java/lang/OutOfMemoryError.html
Where's this come from ? Read the log :
It crashes while loading the textures.
Whats causing it ?
Well, pretty much your lame PC.
Ah, come on, really ? You're still using a 32-bit OS in 2015 ? Upgrade to a fully 64-bit OS ! ... You can't cause your lame x86 hardware doesn't support it ? GO BUY A NEW SYSTEM !
Well, I don't know it exactly, but the barely minimum for DW20 pack for even to launch is around 2GB - 3GB of FREE RAM. But you're only giving the JVM about 1GB. Thats just not enough. And even worse : for some odd reason you can only assign a maximum of 1536MB (1,5GB) to the JVM on a 32-bit OS. THAT's your real problem. You just event can't give the game enough memory to run cause ... well, you just can't. (To explain why would go far beyond this forum.)
Well, it's not the worst gaphics-card ever, but according to the specs listed on wikipedia this card only have 512MB of V-RAM. Even it will work, you will have very low FPS (guess somewhere around 20-30 or less) so the game would be unplayable.
Also, the chip on this card, the G96/b, is very low-tech and may not even offer the functions needed for running the DW20 pack.
So, to sum it up :
FIRST : Learn to read the FAQ / how to use forum search BEFORE posting such invalid/false "bug"-report !
Second : Get a System that meets the year 2015 ! This means at least the following : a) use a 64-bit OS (and as a requirement for this : use 64-bit hardware); b) install at least 8GB of RAM into your system so you can asure to always have around 4GB or so of FREE memory; c) upgrade your graphics-card - as this is not really required, I would recommend it, cause even with a beefy AMD HD 7870 OC you can get drops down to 30-40 FPS, but tryin to play with constant 15-30 FPS just doesn't make fun at all
Third : If it's not possible to do what I mentioned ... well, then you just can't play it. PERIOD.