Fs2004 should be ok.
try da microsoft flight simulator man.
when i first read about vor when i was 14 i then practised on the ms flight sim 98...and this somehow made me understand the VOR @ 80%.the rest of 20% came from reading.just set ya frequency on da nav and practise holdings ..tracking from/to's,inbound or outbounds,wind factors,different entries etc...this should do the thing.