DispatchMessageW Exception

[wc_chan]

Our application is built by VS2005 in Visual Basic and run under dotnet
framework 2.0. In the past few months, the application will abort randemly
with the exception caught before and message "Faulting application
hxmain.exe, version 2.0.3707.19991, stamp 4b849822, faulting module
msvcr80.dll, version 8.0.50727.1433, stamp 471eb5ae, debug? 0, fault address
0x0001500a." reported in eventlog. The stack trace can't tell us where the
application abort

Exception Source: System.Windows.Forms
Exception Type: System.AccessViolationException
Exception Message: Attempted to read or write protected memory. This is
often an indication that other memory is corrupt.
Exception Target Site: DispatchMessageW

---- Stack Trace ----
System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(msg As MSG&)
HXMAIN.exe: N 00000
System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(dwComponentID
As Int32, reason As Int32, pvLoopData As Int32)
HXMAIN.exe: N 00752
System.Windows.Forms.ThreadContext.RunMessageLoopInner(reason As Int32,
context As ApplicationContext)
HXMAIN.exe: N 00380
System.Windows.Forms.ThreadContext.RunMessageLoop(reason As Int32,
context As ApplicationContext)
HXMAIN.exe: N 00082
System.Windows.Forms.Application.Run(mainForm As Form)
HXMAIN.exe: N 00045
HXMAIN.frmSplash.Main()
HXMAIN.exe: N 00049

Any advice?
Thanks