You really shouldn't set the allocated RAM to 512MB (unless your system physically has more than 2GB). The reason is because this will slow Windows down. You may need to increase this setting from its default value of 12MB, but go in the steps provided in the Configuration Module. You want this value as small as possible.

If that doesn't work, send the CADWorx file in to TechSupport so we can take a look at it.

(Yes 32000 is the maximum permitted node number.)