Activate chat plugin and it kills the server, help?

I install and activate the chat plugin on the site for which is was purchased and it "kills" the server, resulting in being unable to access the site except in small very unusable windows, I have to ftp in and manually delete the plugin to get the site back.... I Installed the plugin on my test site and no issues. Could it be the host, any known plugin conflicts, any help would be greatly appreciated.