I have got all my problems resolved finally and have a full working Snow Leopard install updated to 10.6.1 without any problems. I appreciate for all the help that has been provided in here and kudos to all of them who were of great help.

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Processor: Intel Core 2 Duo E6300
Ram: Corsair 4 GB DDR II 667 MHZ
Mainboard:Intel D946GZIS
Hard-Drive: 80 GB Seagate IDE,320 GB WD SATA II & 160 GB Maxtor SATA II External
VGA: EVGA Geforce 9500 GT DDR II Dual DVI 512 MB
DVDRW: Sony DRU-820A
Monitor: ACER AL1717-AS
Sound Card: Creative Sound Blaster Audigy Gamer! & Audigy 2 NX USB
Keyboard: Apple Pro USB
Mouse : Logitech MX 500,MX 700 & MX 518 Gaming Grade Optical Mouse.
OS: Windows 7 RTM, Mac OS X Snow Leopard 10.6.1