Windows 2000
j2re1.4.1 build 10
javaws Version 1.2-beta(build beta-b06)

"Error opening file for writing: C:\Program Files\Java Web Start\javawspl.dll
Hit abort to abort........." - message coming during installation process over existing jaws running.
Steps:
- install jaws (in my case Version1.2[EA] (build ea-b04), which bundled with jre1.4.1 build 10)
- run Application Manager
- now try to install diff version of jaws(Version 1.2-beta(build beta-b06 for example)
- during the installation process after "Directory to install" Next - error mesage coming : "Error opening file for writing: C:\Program Files\Java Web Start\javawspl.dll. Hit abort to abort........."
- click on Ignore, installation completed successfully.