hi,thanks for the answers.I bought this computer from a computer store and they put everything together,they must have formatted the hard drive because i just put the Vista disc in and it installed without any problem or asking me anything about the hard drives.The hard drive is SATA.
The computer now is working.Then,I just tried to install the disc that comes with the motherboard,mainly because i didnt have sound which has to be installed with this disc.It started installing and was about 2thirds done.now the sound is working, when starting the 3rd part about the ethernet i think, it suddenly jumped to Dos and i have this problem.
Also,i think due to this failure to install this disc,i cant connect to the internet yet,it doesnt see any the modem connection.