I am new to WPMU and I have just installed a couple

I am new to WPMU and I have just installed a couple of plugins. I am getting this annoying messages asking me to install more crap. I want this message gone!

I do not want to edit each and every plugin and if this is what I need to do to remove this annoying messages I am afraid that my membership with WMPU will be short lived.

Please advise. Thanks.