"Could not locate the launcher comand" running JDeveloper, Weblogic installers

My actual client has strong security restrictions in their employee's corporate laptops. Although I received the authorization to install JDeveloper 11g and Weblogic in one of them's laptop, the installers keep showing the "Could not locate the launcher comand" error.

I did't want to check security issues, so what I did was "extract" the exe installer contens and run the internal installer.jar jar file (double click on windows or java -jar installer.jar). The installation ran without problems.

If there's no a good compression utility at hand, you can use the “-Djava.io.tmpdir=C:\xxx" flag to obtain the exe internal files (the installer extract the files at this location and you can copy them while the error message is active; after you click the Ok button, the installer will erase them).

If you have Administrator privileges, just use Run As Administrator.

VERR_GENERAL_FAILURE importing Oracle SOA Pre-built VM

I downloaded and tried to import the pre-built VM for SOA on VirtualBox (in my 64bits Win 7 laptop), and I found this error: Could not create the clone medium (VERR_GENERAL_FAILURE).

After googling and finding nothing useful, I cheked the MD5 sum of the downloaded files. One was incorrect. I downloaded it again and the VM worked without problems.

I never before bothered cheking the MD5 sums, but I guess I'll do it from now.