You have not mentioned the full version of your XE database. If it is 10.2.0.1, you cannot directly upgrade it to 11.2 using >DBUA. You have to first upgrade it atleast to 10.2.0.2 before going to 11.2.In which case, I would look into other options, such as Oracle's Data Pump.
Please refer to Metalink Notes 980693.1 and 837570.1 for more details.
1008016 wrote:To upgrade to 11gR2, you need to be at 10.2.0.2 - hence the error
Windows 7 64 bit, please find the below error message when I am trying to upgrade through Database Upgrade Assistant
"Could not get database version from the "oracle server" component.The "CEP" file "D:\app\usr\product\11.2.0\dbhome_1\rdbms\admin\rdbmsup.sql" does not provide the version directive