eCommerce 1.5 can I update for Joomla! 2.5

Thank you I did the permission 755 for folder an for files also and the and the website is working bit I have another problem all the links in my website is not working and this message is coming ^{(No input file specified )}

can you help me plz

So, you r site works fine on local copy on your computer but it can not run when you copy it to webserver ?
Are you sure you changed configuration.php correctly? There are menu guides on internet how to do that.