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I’m currently running Microsoft SQL Express Server.
When one user performs a query without committing it, it locks the entire table.
The problem is that malicious users might “ruin” the database by doing so on purpose.
How can I prevent this from happening?
You need to understand database isolation levels http://en.wikipedia.org/wiki/Isolation_(database_systems). Most likely you are running queries as seralizable which will have that effect. Try submitting some code.