Plugin Admin page not loading

WordPress MU 2.7.1

pSek hosting

When I’m logged into my WordPress MU Dashboard, the Plugin page will not load. I am unable to activate/deactivate plugins from the admin area. Please advise if anyone else has experienced this problem and what the potential fix may be. I’m thinking it has something to do with the original WordPress MU install? When the page was working initially it still took a long time to load and would often time out. Now it doesn’t load at all.

Thank you!