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Thank you. My system is Fedora 16, so I don't have Tex Live manager installed. However, this doesn't seem like an issue. The main problem is that I could not find helvetic package after running getnonfreefonts. Do you know where I could get the package??

Thanks in advance.

I installed TeX Live recently, but it seems I didn't install it completely, for when I compile my documents, there always shows something missing. For example, when I try to compile a beamer file, I will get something like:
I can't find file 'phvr7t'
And it generated a missingfont.log:
mktextfm ...