Plug-in, MIDI, and General Sound Playback Problems

I am desperately needing help. First off, when i first open up Sonar 8.5.2 it says "There are no audio devices for the current driver model on your system". My driver type is ASIO, but under ASIO i can't hear any of the plug-ins, MIDI does not work, and I have problems just hearing audio playback. I need to use ASIO though because im using the Lexicon Omega module to record and it works with ASIO. I'm using a Dell Studio XPS 1645, and my sound card is a ATI High Definition card. If someone can please help me id really appreciate it.

-Justin

Thats the thing though, when i go under Options>Audio>Drivers it shows nothing, no input or output drivers. I cannot hear MIDI, I have the Microsoft GS Wavetable Synth assigned as my MIDI output device. But when i open a MIDI project it says im missing the Microsoft GS Wavetable SW Synth. And i cannot hear any of the plug-ins when i assign them to a track, and i hear nothing when i play a piece of audio on a track. I have the outputs on the tracks to Master. When i open a normal non-MIDI project, it says that the Master and Metronome buses are assigned to a silent hardware output.

I just reinstalled the drivers for the lexicon the other day and it still isnt working. Im running windows 7, and i was told that lexicon does not have a driver for a 64 bit version of sonar on windows 7, is this true? If it is, what other modules would work good and do the same thing as the lexicon but be compatible? I do not want to run sonar in 32 bit so if the lexicon isnt going to work on the 64 bit i need to buy something else.