QA reads the fora (here and elsewhere), tries to reproduce reported issues (if not yet reported) and creates internal bug reports for the ones they can reproduce.
To get personal technical support with the game (from crashes to quests that get stuck), please mail
support. They will ask for extra information if necessary (savegames, dxdiag reports, ...), triage everything using the internal bug tracker and in cooperation with the QA team, and will work directly with you to find a solution.