Still with 1 GB...
decreased res to 1024x768 - in the main menu I still had the "let's jump to the map for a sec" thingy, but after it returned to main menu i could press Single Player and run the game. Played for 5 min (was more less playable) and then the game crashed , windows informed me that there was some error and the application gonna be closed.
error.log this time:
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\\test\\menu_tiles_1.tga.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\\test\\menu_tiles_2.tga.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\\test\\menu_tiles_dialog_2.tga.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\\test\\menu_tiles_line.tga.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\\test\\slider_line.tga.
Clausewitz Error[sound.cpp:240]: Duplicate sound: land_event_02
Clausewitz Error[sound.cpp:240]: Duplicate sound: money_out
Clausewitz Error[sound.cpp:250]: Sound country_select not found.
Clausewitz Error[sound.cpp:250]: Sound country_select not found.
Clausewitz Error[sound.cpp:250]: Sound close_window not found.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\celticgfx\.\Gnormal.dds.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\Wanormal.dds.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\normal.dds.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\.\Dnormal.dds.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objectnormalmon\.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\.\Fonormal.dds.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\Farnormal.dds.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\cnormalgfx\.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\celticgfx\.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\.\Wanormal.dds.
Clausewitz Error[texturehandler.cpp:106]: Couldn't find texture file: gfx\cityview\objects\common\.\normal.dds.
Clausewitz Error[sound.cpp:250]: Sound close_window not found.
Clausewitz Error[sound.cpp:250]: Sound diplomaticoffer not found.
Clausewitz Error[sound.cpp:250]: Sound diplomaticoffer not found.
Clausewitz Error[sound.cpp:250]: Sound diplomaticoffer not found.
Clausewitz Error[sound.cpp:250]: Sound diplomaticoffer not found.
Clausewitz Error[sound.cpp:250]: Sound diplomaticoffer not found.
Clausewitz Error[sound.cpp:250]: Sound diplomaticoffer not found.
If i only knew that more ram will help

..stupid computers:/
M