Can't open .dmg (Disk Images) since 10.4.8

Hi
Since I installed 10.4.8 update I cannot open any .dmg files - including ones that I have previously opened with no problems.
Whenever I try to open one I get a dialogue pop up which says:
"Warning.
The following disk images failed to mount"
It then states the name of the .dmg and says "Reason: Device not configured"
This is exactly the same for every .dmg.
i have repaired permissions, restarted etc.
Any thoughts or fixes?
Thanks
R

Hi guys.
Thanks for the response.
I found the solution on another forum. And everything is working fine now:
Move these files to the Desktop and restart and try a .dmg;
/System/Library/Extension.kextcache
/System/Library/Caches/com.apple.kernalcaches/
I actually had to restart twice as the first restart made a mess of my bluetooth mouse, but after the second everything is fine.
Hope that helps you as well maree
R

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