Configuration:
ZEN CART Version 1.3.7
PHP 5.2.1
WINDOWS IIS 6.0

Went to Admin>Modules>Payment to make changes.
Below are the error messages I received.
My host has backup and restore capability - I restored the admin folder to May 13 and there was no change.

I am using PayPal IPN

The file named paypalwpp_bu.php is a backup of paypalwpp and I do not use it.

Because of the error, I cannot make any changes to any payment modules.

Can anyone please help me?

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Warning: include(e:/web/public_html/davidollc/gallery_web/includes/languages/english/modules/payment/paypalwpp_bu.php) [function.include]: failed to open stream: No such file or directory in E:\web\public_html\davidollc\gallery_web\admin\modules.php on line 174

Warning: include() [function.include]: Failed opening 'e:/web/public_html/davidollc/gallery_web/includes/languages/english/modules/payment/paypalwpp_bu.php' for inclusion (include_path='.;C:\php5\pear') in E:\web\public_html\davidollc\gallery_web\admin\modules.php on line 174

Fatal error: Cannot redeclare class paypalwpp in E:\web\public_html\davidollc\gallery_web\includes\modules\payment\paypalwpp_bu.p hp on line 2898
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Thank you,
jund