When I try to open some of usic files (mp3, ogg, wav,...) i get the sound of damaged file (i know it's not damaged). This happends when I try to play any file with any player. I have SoundMAX Integrated Digital Audio, i installed codecs .. Can somebody help me?

those integrated sound thingys are hard -- it's like one chip behind another.
the codecs obviously degrade the sound some but otherwise
there are three different sound drivers for your sound chipset -- based upon which motherboard the sound chipset is on. so check and see if you are loading the right module
what kind of motherboard is it ? even on the various motherboards it can be by different manufacturers i think
intel uses snd-intel8x0
i think asus make a driver themselves
ATI seems to think Linux doesn't exist so i'm not sure about that one
there might be alsa driver for all three ?
other than that
there can be two things that makee garbled sound, buffer size, or bus latency set too short
prob more also i don't know about.

as root run the command
lspci -v
and see what it says the sound card is
over on the left it will say something like 02:0a.0 or something for your soundcard
i will call this <cardname>
also you can note here the manufacturer of the sound thingy and that will give clues about the right driver
now use the cammand
setpci -v -s <cardname> latency_timer=ff
for me with 02:0a.0 that would be
setpci -v -s 02:0a.0 latency_timer=ff
see if that helps

you will also most likely have to make a ~/.asoundrc and make some more adjustments to the alsa buffer

Here is the output:

0000:00:00.0 Host bridge: ALi Corporation: Unknown device 1683
Subsystem: Asustek Computer, Inc.: Unknown device 810c
Flags: bus master, fast devsel, latency 0
Memory at e0000000 (32-bit, prefetchable) [size=32M]
Capabilities: [40] #08 [2101]
Capabilities: [b0] AGP version 3.0

0000:00:01.0 PCI bridge: ALi Corporation PCI to AGP Controller (prog-if 00 [Normal decode])
Flags: bus master, 66MHz, fast devsel, latency 64
Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: e2000000-e3ffffff
!!! Unknown prefetchable memory range types d000/dfff

0000:00:02.0 PCI bridge: ALi Corporation M5249 HTT to PCI Bridge (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=32
Memory behind bridge: e4000000-e47fffff
Capabilities: [b0] #08 [0023]
Capabilities: [f0] #08 [802c]

0000:00:03.0 ISA bridge: ALi Corporation M1563 HyperTransport South Bridge (rev 20)
Subsystem: Asustek Computer, Inc.: Unknown device 810b
Flags: bus master, medium devsel, latency 0

0000:00:03.1 Bridge: ALi Corporation M7101 Power Management Controller [PMU]
Subsystem: Asustek Computer, Inc.: Unknown device 810b
Flags: medium devsel

0000:00:04.0 Multimedia audio controller: ALi Corporation M5455 PCI AC-Link Controller Audio Device (rev 03)
Subsystem: Asustek Computer, Inc.: Unknown device 810d
Flags: bus master, medium devsel, latency 64, IRQ 21
I/O ports at e000 [size=256]
Memory at e4800000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [40] Power Management version 2

0000:00:0e.0 IDE interface: ALi Corporation M5229 IDE (rev c5) (prog-if fa)
Subsystem: Asustek Computer, Inc.: Unknown device 810b
Flags: bus master, medium devsel, latency 64, IRQ 19
I/O ports at f000 [size=16]

0000:00:0f.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) (prog-if 10 [OHCI])
Subsystem: Asustek Computer, Inc.: Unknown device 810b
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 18
Memory at e4802000 (32-bit, non-prefetchable) [size=4K]

0000:00:0f.1 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) (prog-if 10 [OHCI])
Subsystem: Asustek Computer, Inc.: Unknown device 810b
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 18
Memory at e4803000 (32-bit, non-prefetchable) [size=4K]

0000:00:0f.2 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) (prog-if 10 [OHCI])
Subsystem: Asustek Computer, Inc.: Unknown device 810b
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 18
Memory at e4804000 (32-bit, non-prefetchable) [size=4K]

0000:00:0f.3 USB Controller: ALi Corporation USB 2.0 Controller (rev 01) (prog-if 20 [EHCI])
Subsystem: Asustek Computer, Inc.: Unknown device 810b
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 23
Memory at e4805000 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Capabilities: [58] #0a [2090]

0000:01:00.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (rev 01) (prog-if 00 [VGA])
Subsystem: Hightech Information System Ltd.: Unknown device 2012
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 16
Memory at d0000000 (32-bit, prefetchable) [size=128M]
I/O ports at d000 [size=256]
Memory at e3000000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [58] AGP version 3.0
Capabilities: [50] Power Management version 2

0000:01:00.1 Display controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (Secondary) (rev 01)
Subsystem: Hightech Information System Ltd.: Unknown device 2013
Flags: 66MHz, medium devsel
Memory at d8000000 (32-bit, prefetchable) [disabled] [size=128M]
Memory at e3010000 (32-bit, non-prefetchable) [disabled] [size=64K]
Capabilities: [50] Power Management version 2

0000:02:07.0 Communication controller: Intel Corp. 536EP Data Fax Modem
Subsystem: Intel Corp.: Unknown device 1000
Flags: bus master, medium devsel, latency 64, IRQ 19
Memory at e4000000 (32-bit, non-prefetchable) [size=4M]
Capabilities: [e0] Power Management version 2

So, I can see only multimedia controller ...not sound card ..

I think this is my sound card:

Vendor: ALi
Model: Corporation M5 455 PCI

AC-LINK CONTROLLER AUDIO DEVICE

Module: SND-INTEL 8x0

Can somebody help me?