Any mods installed?
Since you don't have U-Boat missions add-on, be sure to get the latest patch and bring the game to v1.4. This will make it much more stable.
What do you mean by
Quote:
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Memory for Windows manualy changed from 750 Mb to 1,5 Mb...
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??
Are you referring to windows paging file / virtual memory? If you have only 512 MB of RAM that this is too little for SH4. For optimum game play you need 2GB of RAM to play SH4.