i had similar messages (and many errors). I was working with a 16-bit screen mode. But when i changed to a 32-bit screen mode, it worked fine.
I think there is a bug with the screen rendering. Perhaps when you installed the theme, it changed something there, so it worked.
I tried to run GXexplorer and it produced four errors:
"Cannot open file C:\Windows\Media\%SystemDrive%\Documents and Settings\Other Documents\Themes ect\Princesse Mononoke\MonDown.wav."
"An error occurred while trying to load the scrpts.
Access violation at address 0055ACBE in module 'GXExplorer.exe'. Read of address 00000000"
"Access violation at address 00556287 in module...
