Oracle SQL Developer freezes and locks up computer randomly

I attempted to find a solution to this before posting. I looked through the first 40 pages of this forum and on Google, through the Developer documentation, etc. with no luck.
The problem: while using Oracle SQL Developer, the computer randomly freezes. Things work, but it hangs too often and for too long to use. This is random - it can happen every 10 seconds or every 2 minutes. The mouse will lock up, and the keyboard buffer will get all messed up. For instance, if it happens to freeze while I'm hitting "backspace", it will delete many lines of text (I've lost a bit of work because of this in the past). The freezing will last about 2 to 20 seconds, and the only way out of it is to ctrl+alt+delete and kill SQL Developer.
If SQL Developer is running, and I'm in a different window - it will freeze the other windows as well. Again, it's impossible to use unfortunately. My coworker doesn't have the same problem, and he's connecting to the same database with the same version using Windows Vista. It must be something on this computer. I reformatted about 1 month ago, so it's a pretty fresh install and I haven't installed much of anything yet.
I'm using Windows Vista Enterprise 32-bit w/SP1.
This was occurring with older versions of SQL Developer (1.2). I'm using the newest install that included the Java JDK. I've completely removed Java, my Oracle installs, and a host of other attempts to fix this, and nothing changes. I've tried running the .exe in the bin directory as administrator as well.
Currently using Oracle Developer 1.5.1.54.40.
Any ideas?

I tried dumping the contents, but the java dump wasn't showing anything at all, and it would never freeze while I had the console window in focus, so it wasn't very helpful unfortunately.
I fixed this issue by uninstalling the Java runtime on this machine and installing the Java JDK 6 Update 7 from java.sun.com/javase/downloads . I then downloaded the SQL Developer 1.5.1 version without the Java runtime included, and pointed it to the Update 7 .exe file upon first load.
I was using JDK 6 Update 6 previously, and it must have been behind the errors. Note that the Update 7 has to be downloaded from that website as it's a new version that hasn't been posted on the regular java.com site yet.
Message was edited by:
user645599

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You have started this annoying discussion.
I don't have any problems with my OS instead of you.
I have already told you what to do, if you have no idea how to do that just go and buy yourself another support subscription from your mac support.
The missing class is not available from any code-source or loader in the system. check that.
what version of JAVA do you have in your fancy OS? most of the time upgrade java to the latest version will fix the issues.
Update java from sun website not from another mac tore.

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