The application avast! quit unexpectedly

I run the latest version of leopard, and avast keeps quitting and relaunching automatically.
I can’t access system preferences, spotlight etc and there are no more desktop icons on my desktop…
When clicking the “report” button I get this message:
[i]Process: avast! [342]
Path: /Applications/avast!.app/Contents/MacOS/avast!
Identifier: com.avast.MacAvast
Version: 2.74R0 (2.74R0)
Code Type: X86 (Native)
Parent Process: launchd [71]

Date/Time: 2008-02-10 20:41:27.566 +0200
OS Version: Mac OS X 10.5.1 (9B18)
Report Version: 6

Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000008
Crashed Thread: 0[/i]

Any ideas? ???

Yes, it might be the same problem as here, please, try the solution and report whether the problem is gone:

http://forum.avast.com/index.php?topic=32434.0