Ok, strangly enough, it didn't work.

So maybe it better to skip Leopard, and go to Snow leopard instead?
Is there a distro that you recommend for my pc?

Elvir.

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Desktop: Dell Inspiron 545
Mobo:Inspiron 545
CPU:Intel E7400 2,8GHz
RAM:2GB DDR2 800 (2x1GB)
GRAPHICS:Ati HD4670 1GB OC
ETHERNET:Realtek RTL8102E/8103E
WIRELESS:http://www.icidu.com/ProductDetail.aspx?pd=1318285]
HDD:Western Digital 320 GB, 7200 RPM, SATA.
Ext. HDD:Toshiba MK1234GAX 120 GB, 5400 RPM, IDE.
AUDIORealtek ALC888