After switching OP, WP isn’t working properly

Hi everyone.
I have installed WP on my GoDaddy Linux server, and it was working nicely. For some reason, I switched to Windows and then switched back to Linux. (I know this is silly, but it has already happened -.-)
Now all the contents of my WP blog are still there, but they are not displayed properly.
1) At the top of each page, there is a line like this:
/home/content/x/y/z/abcedfg/html/wordpress/wp-content/plugins/wp-cache/wp-cache-phase1.php
The line continues to exist even after I have deactivated and deleted the WP-cache plugin.
2) Everything is displayed on the left. The right sidebar is on the left, overlapping the main post body. However, I guess the css is still working because the font styles are OK.
Does anyone know what might be causing the problem and how to solve it? Any idea will be appreciated. Many thanks in advance!