server startup problems

I trying to run OpManager from an XP pro host, where I'm also running my webserver and mysql. Through these boards I managed to overcome the first opstacle (datadir in my.ini pointed to a non-existing folder, which I then created). Now I'm getting this message, when trying to start OpManager server from command line:

SQLException while getting database connection. Check if database daemon is runn
ing
java.sql.SQLException: Communication link failure: java.net.SocketException, und
erlying cause: Connection reset

** BEGIN NESTED EXCEPTION **

java.net.SocketException
MESSAGE: Connection reset

STACKTRACE:

java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:1258)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:507)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1731)
at com.mysql.jdbc.Connection.<init>(Connection.java:559)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:358)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at jdbc.CreateSchema.instantiateConnection(CreateSchema.java:145)
at jdbc.CreateSchema.init(CreateSchema.java:83)
at com.adventnet.nms.startnms.NmsMainBE.main(NmsMainBE.java:335)
at com.adventnet.launcher.nms.StartNmsJdbc.run(StartNmsJdbc.java:240)
at java.lang.Thread.run(Unknown Source)

** END NESTED EXCEPTION **

at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:1290)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:507)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1731)
at com.mysql.jdbc.Connection.<init>(Connection.java:559)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:358)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at jdbc.CreateSchema.instantiateConnection(CreateSchema.java:145)
at jdbc.CreateSchema.init(CreateSchema.java:83)
at com.adventnet.nms.startnms.NmsMainBE.main(NmsMainBE.java:335)
at com.adventnet.launcher.nms.StartNmsJdbc.run(StartNmsJdbc.java:240)
at java.lang.Thread.run(Unknown Source)
Exiting OpManager

Now, I'm propably doing alot of things wrong - I just don't know what ;) I know the mysql-nt.exe is running, and my mysql installation is working (I've used it for my website for about six months without any trouble). Should I have chosen the working datadir for the current mysql installation, or is there something else I'm doing wrong?