Login screen takes me to white page

Hoping someone can help me out here. I was running an old old version on WordPress (2.0.6) without the ability to do an automatic upgrade so I did it manually. I followed all the steps, upgraded and logged in fine. Everything seemed to be doing ok.

I started re-activating my plugins and started getting these blank white pages. I’d click to go to a plug-ins admin menu and just get a blank white page.

I cleared my cookies and restarted my browser and attempted to log back in. This took me to a white page. Nothing else.

The blogs main page works fine, but clicking on individual posts takes me to a blank page. Could this be the PHP Memory problem? I’m hosted on Netfirms and my blog is located here.

Any help would be really appreciated!