Getting errors when loading up my site

Give this link a good read.

http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F

If it’s that plugin then you should be able to get around it by using FTP or whatever file management tools your host provides you with and navigate to /home/mgowang/public_html/wp-content/plugins/ and delete the WP-Client directory. Just that one directory and nothing else.

Please make sure you have a backup of that directory first as a precaution.

That eval()'d code(1) error bug me though, can you also scan your site with Sucuri SiteCheck?

http://sitecheck.sucuri.net/scanner/

That’s also as a just in case.