after some searching, i found a solution for the internet speed problem:

replace the original kext with the one found here:
http://cid-8b65993ef55cf014.skydrive.live.com/home.aspx

also replace realtek kext inside IONetworkingFamily.kext/Contents/Plugins

the solution was found here:
http://www.insanelymac.com/forum/ind...owtopic=181856

i hope it's ok to post links to other forums, if not then please let me know so i can edit my post. thanks.

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CPU: AMD Athlon 64 X2 5000+
RAM: 2 x 1 Gb
2xSATA HDD
ATA DVDRW
MB Asus M2N Nvidia MCP61
Video: GeForce 8600 GT 256 Mb RAM
ADI 1988 onboard audio
Audigy soundcard
Realtek lan