System-wide video stutter problem

Question

When I start a video chat with anyone it works well until some point when the computer begins to stutter as well as the video and audio from the video chat to the point that the computer becomes almost unusable. Once I close the video chat the computer comes back to normal. If I don't close the chat window then sometime later the green light on the iSight stops glowing and my side of the video on the chat gets stuck. At this point I can still see and listen to the other party and they can listen to me.
Other times this "bug" or whatever it may be called happens earlier in during the chat by having the video chat at the sime time as watching a video on Safari (youtube or any flash content). When this happens, both the iChat video and the Safari video start to stutter.
This has also happened while playing WoW.
I have tried reinstalling OS X 10.5 and it just comes back to haunt me.
Thanks for your help

Answer 1

I just reinstalled OS X 10.5 and still have the same problem. I would say it gets worse and worse. Last thing that happened was I was playing World of Warcraft and the computer just started to stutter, mouse, video, sound, everything an then it shut down. After reboot i got this error report:
Mon Nov 17 22:06:38 2008
panic(cpu 1 caller 0x0019CCE4): "simple lock deadlock detection: lock=0x5356a0, cpu=1, owning thread=0x8400048"@/SourceCache/xnu/xnu-1228/osfmk/i386/locks_i386.c:317
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x2e5fcdd8 : 0x12b0e1 (0x4555b4 0x2e5fce0c 0x133238 0x0)
0x2e5fce28 : 0x19cce4 (0x45cad8 0x5356a0 0x1 0x8400048)
0x2e5fce48 : 0x13393d (0x5356a0 0x340b7000 0x8eabf020 0x109)
0x2e5fce88 : 0x13fd3c (0x340b7000 0x39d78b8 0x1f3a0 0x3bc6bb4)
0x2e5fced8 : 0x199303 (0xa10dc680 0x109 0x39d65d0 0x0)
0x2e5fcf28 : 0x1a6c55 (0x0 0x2e2d75cf 0x0 0x191926)
0x2e5fcf78 : 0x1ae60e (0x45defc60 0x340b7000 0x2e5fcfa8 0x6)
0x2e5fcf98 : 0x4443c7 (0xde 0x45defc60 0x39d65d0 0x1)
0x2e5fcfd8 : 0x19e6de (0x45defc60 0x0 0x0 0x0)
0x45defd08 : 0x2e2d592d (0x4292400 0x14 0xf 0xc)
0x45defd48 : 0x2e2d6e52 (0x3d3f200 0x0 0x1 0x3d3f600)
0x45defd68 : 0x2e2d4360 (0x3d3f200 0x2e2d0740 0x9f3fd20 0x3d3f600)
0x45defda8 : 0x2e2ca312 (0x3d3f600 0x0 0x3d3f600 0x1991a6)
0x45defdf8 : 0x2e2c985d (0x3d3f600 0x45defe6c 0x45defe28 0x8c499620)
0x45defe38 : 0x2e2d3bb9 (0x3d3f600 0x45defe6c 0x45defe88 0x13ff64)
0x45defe98 : 0x2e2bd8b8 (0x3d3f600 0x429b920 0x1 0x45defee0)
Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.ACPISMCPlatformPlugin(3.0.0d11)@0x2e2d1000->0x2e2dafff
dependency: com.apple.iokit.IOPCIFamily(2.4)@0x2e318000
dependency: com.apple.driver.AppleSMC(2.0.0d5)@0x2e2ba000
dependency: com.apple.driver.IOPlatformPluginFamily(3.0.0d11)@0x2e2c3000
dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x2e32e000
com.apple.driver.IOPlatformPluginFamily(3.0.0d11)@0x2e2c3000->0x2e2d0fff
com.apple.driver.AppleSMC(2.0.0d5)@0x2e2ba000->0x2e2c2fff
dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x2e32e000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9A581
Kernel version:
Darwin Kernel Version 9.0.0: Tue Oct 9 21:35:55 PDT 2007; root:xnu-1228~1/RELEASE_I386
System model name: MacBook2,1 (Mac-F4208CA9)
If anyone understands what this means......
Thanks again