Ok, thanks for your reply. Now I know I should not start with mining. Tell me please: which hash rate is good to start with mining? (17 Mhash/s is not enough to pay off, I know)

I'd like to try it. I downloaded CGMiner, latest graphics card drivers, Ati SKD and set up StartMining.bat . I wrote in it:
cgminer -o http://api.bitcoin.cz:8332 -u Manderius.worker -p *MyPassHere*
but it just starts with the first line "CGMiner started" and after 6 seconds it closes.
I also tried
cgminer -o stratum+tcp://stratum.triplemining.com:3334 -u Manderius_Worker -p *MyPassHere*
and it also doesn't start working, just closes itself.
Password and usernames are OK, when I look into logfile.txt it says
JSON-RPC decode failed: (unknown reason)
Stratum authorisation success for pool 0
Pool *adress* alive
List of devices: 0   Cedar
Selected 0: Cedar

That is all. I searched on Google but I've found nothing.

When you bump your post 50 times it will not make you full member. As RodeoX said, your post must have some value to count.

Hello. I have ASUS X72J and I would like to know if is it good idea to mine BTC with it. My hashrate is about 16 Mhash/s. Components:
Intel core i3
4Gb RAM
ATi Mobility Radeon HD 5470 (1GB)
I would like to join some pool, but will it be profitable?