Please help - audio not in sync

Have you tried going into preferences and adjusting your recording latency to a smaller number?

Do the audio transients of the recorded track appear to be that late in the track view or do they appear to be located correctly but aren't heard at the moment the Now time cursor passes over them? Which track is in time with the metronome if you enable it on playback, and is the click in sync with the Now time cursor on both recording and playback? The drum track is audio or MIDI? If MIDI, what synth is it driving?
 
As Steve noted, a whole second is way too long to be a garden-variety latency issue - half a measure at 120BPM!

First, I suggest you use ASIO driver mode if you're not already. Then make sure "Use ASIO Reported Latency" is checked in the Record Latency Adjustment section of Preferences > Audio > Sync and Caching. If the playback timing is still off with a new recording, then you'll want to measure actual latency with a tool like the free CEntrance Latency Tester (Google it), and enter the difference between what CEntrance reports and what SONAR detects (Total Round Trip latency on the Driver Settings page) as a "Manual Offset" (back on the Sync and Caching page).
 
Generally the Manual Offset needed to get perfect record latency compensation is a fraction of a millisecond (20-40 samples), and would not be noticeable in a normal listening context. But if the automatic record latency compensation isn't enabled, that might get noticeable if you're running a big ASIO buffer and direct-monitoring your guitar (or playing acoustic?).