dear sandi,

thank you for the bug report!

wow, that's an impressive list of problems that i've not seen before, and i've seen a lot \:\)

since it seems to be mentioning security, if i had to guess, i might guess that you perhaps you are not running MS Windows with admin priv ? i think you may need admin priv for windows to allow the program to read/write to/from another program's active memory (in this case, plant tycoon).

just a guess \:\)

the other thought that came to mind when i saw:
CodeBase: file:///C:/Documents and Settings/sandi/Local Settings/Temporary Internet Files/Content.IE5/WTEFCPA3/The Constant GardenerBeta.exe

is that you are running the program from within a zip folder in a temporary file directory.

perhaps extract the program to the desktop and try running it from there?

good luck and thanks again for the bug report!
-Borg