Firstly it's 'profile' and
not 'profil' (unless you're French)
Second: The only way somebody can hack your myspace, is if they type in your password - so either it was blatently obvious - something like 'a' four or six times. If it was complex enough - it wasn't a phraze, sentance etc. and contained a few numbers to replace letters - then whoever took control of your account installed a keylogger onto your computer.
Get Stop Zilla from cnet (
www.cnet.com) which should detect it, and anything else - such as spyware and adware - block it, ban it, stop it.
Brillant program for 29squid - you can download the trial version for free though - just to see if it works on your computer.