How Can I Sync Audio And Video Together? Options

[sabicho]

I am planning to upload a video I have just recorded of me playing the guitar with my Nokia X2 since my phone has a better real time movement rather than my slow webcam which has some sync delays.I have not connected any audio output from my mobile, all I need is a good video.
And at the same time I separately plugged my guitar through a mixer then to my computer Just to get a good audio quality.
Now how do I Join and sync the two seperate files [audio and video]. I have used Windows Movie maker But it doesn't work and gives me errors all the Time. I search online and tried some video conversion tools I found on http://www.mediatool.com which claim to have editing functions and solve non-sync issues, but failed.
Please could you tell me any other software to Join and sync the audio and video files
Thanks in advance :-)

This post has been edited by sabicho: Aug 29 2011, 09:00 AM