Sort out the error from bestavsystems.co.uk

We got this error when we are trying to see the product details from our website [login to view URL] (opencart ecom): Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /home/zimcos/public_html/[login to view URL] on line 1018 Parse error: syntax error, unexpected T_STRING in /home/zimcos/public_html/[login to view URL] on line 1018 From ADMIN, I can see that might be a problem with the module Questions and answers that is compatible only with PHP 5.3 onwards. Error! The extension is not compatible with your current PHP version - 5.2.17. Please upgrade your PHP at least to version 5.3.0. Need this error to be resolved and to be able to use the site.