Law for Consumers - Sony Vaio aw21s/b?

I have had my laptop away now three times for the same problem with sony, i have had it less than a year what legal rights do i have. It went away first time when camera, fingerprint reader, bluetooth not working. It came back a week later with new components. It broke 3 days later with the exact same faults and went away, this time they blamed a update from microsoft, removed it and everything working. Now a week later the same faults are back again and i checked that update not there so that is not the problem After now two repairs and 3 sets of faults the same reappearing. And the fingerprint reader problem has came and went since september. What rights do i have.