Your original problem was probably with Java, somehow it became corrupted. You may want to try an earlier version of java 1.4 or the new beta version java 6. you can get them at the links below. Use the offline installers
http://java.sun.com/j2se/1.4.2/download.html http://java.sun.com/javase/6/
As far as the files not verifying have you previewed them if you have and they are OK then you can go to the folder where you save your incomplete and copy it. Then paste it in your share folder and rename it just remove T-854388000- part of the name or completely rename it if you wish.