You have a sound card..... not a very good one. probably a realtek.
Sound cards in most new computers and especially lap tops have the sound card built into the motherboard as a chip. They are designed to play mp3 and wave files for video, music and games. They are not designed to handle the load we place on them... full duplex.... stuff going in and out in sync. The drivers are designed to let them do that job and not much more.
We need to have a sound card that CAN handle the load and process synths in real time while getting 20 tracks to the speakers in sync, and do it all without more than a 5 ms delay. (approx)
I said : A decent USB INTERFACE running ASIO will solve the issues. (Post #24 last line) There are interfaces for audio and midi that are specifically designed to do multi track full duplex recording and playback and they generally are external, use USB as the connection method, and run ASIO as the driver.
All the other stuff about freezing and bouncing was offered simply as a possible work around. Sometimes it works and sometimes it doesn't.
Yes, Cakewalk says that MC6 is ready to run straight out of the box. And for some people, it does. And generally at a very basic level. I have seen some folks here make the claim that they can do multi tracks and synths and have no issues on factory cards..... one guy took me to serious task over that issue. For the other 99%, yeah, you can run some basic stuff but to get into synths and multiple track projects and keep everything running smooth and synced up, an aftermarket interface is a requirement.
Most folks who are serious about recording at home will invest the money into a decent interface that lets the process run smoothly so they can concentrate on the music and not the process.