UPGRADE PROBLEM

[Guest Copper & Gifts]

After doing my upgrade, every time I try to add a product to my basket I get the following message:

Not Found

The requested URL /index.phpclocksafrican-mini-wall-clock-21x18cm-mapp_2.html was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

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Apache/2.2.8 (Unix) mod_ssl/2.2.8 OpenSSL/0.9.8b mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 PHP/5.2.5 Server at www.copperandgifts.com Port 80

The url should read /index.php/clocksafrican-mini-wall-clock-21x18cm-mapp_2.html was not found on this server.

How can I fix this problem? I am not a computer know all and I really need it explained in the simplest of terms.

Thanks