1.5 upgrade stalls out, invalid argument in wp-settings

I deactivated the plug-ins before doing anything. Something happened with my first upgrade and it didn’t work so I redid. ( May have had to do with something perhaps happening with the server as the control panel to my website had gone done at the same time.) But, I redid it anyway. Things started moving again when my control panel started working again. Then….
I get to the upgrade point and this appears:
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Warning: Invalid argument supplied for foreach() in …../wp-settings.php on line 113
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On line 113 is the following:

foreach ($current_plugins as $plugin) {
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Then trying to get to my page or the administration panel I get:

Fatal error: Cannot redeclare textile() (previously declared in …./wp-content/plugins/textile1.php:54) in …wp-content/plugins/textile2.php on line 64
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On line 54 is
$clas = “(?:\([^)]+\))”;

and on line 64 is
function textile($text,$lite=”) {
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Help. I don’t have a clue what to do.

Thanks!