Could not find rtl_work.TB.vhd

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by typing this, how do you fill <your vhdl files>, by typing my vhdl files root (C:\Users\Alfonso\Desktop\PFC\altera) returns this:

(I typed vsim> vcom -work rtl_work C:\Users\Alfonso\Desktop\PFC\altera)

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You've passed it a directory, not a VHDL file. You need to pass the vcom command the files that end in .vhd. You need to compile all of your files into the work library. If you are using Modelsim-ASE, then you do not need to compile Altera libraries.

Cheers,

Dave