This is old, but there's a solution on the Oracle forums here:
http://forums.oracle.com/forums/thread.jspa?threadID=312212
There are a couple of possible solutions on that thread, but the one that solved my instance of this "java.lang.UnsatisfiedLinkError: t2cGetCharSet" error was removing duplicate entries in my PATH environment variable that pointed to Oracle bin directories. In my case, I had C:\OraHome_1\bin, which I wanted, but I also had an old OracleXE\bin (this isn't the actual path, I can't remember what it was) entry. After I removed OracleXE\bin from my path, it worked like a charm.