The included presets for Native Instrument's Guitar Rig 3 LE may not appear when using the 32-bit version of the plug-in on Windows Vista 64-bit.  This can be fixed by simply opening the standalone version of Guitar Rig 3 LE once, doing so will ensure that the plug-in version can locate it's presets.  To correct this do the following:

1. Close your Cakewalk application
2. Open the standalone version of Guitar Rig 3 LE, START | All Programs | Native Instruments | Guitar Rig 3
3. Verify that presets are available in standalone version
4. Close the standalone version
5. Re-open your Cakewalk application and insert the Guitar Rig 3 plug-in, your presets will now be available