Can I do mining with a normal PC?
Can i do mining with a normal PC?
Yes, you can.
I don't have too many expectations. Maybe 0,1 in one week?
No, not possible. You will effectively compete against all computational resources on Earth, that are now cracking this nut. If I can estimate, a humble home PC will produce around 1 - 100 MH/s, based on CPU or GPU mining stats. This range covers different CPUs and single-GPU computers. You can compare hash rate with the profit estimate using this calculator. Based on the hash-rate, your electricity bill will much out-weight any profit from mining.
To achieve a 0,1 BTC/week you'd have to invest in a pretty expensive, power-hungry ASIC box that can produce tens of GH/sec, subject to ever-increasing complexity.