>HI, everyone
>
>Q.1 i had install the SP3 into my client's PC, but the ERROR
> C00000005 (sometime) still appear ?? (they are running on
> MYMAIN.FXP, not executable a .COM)

Can you give a little more info?

>Q.2 i try to compile MYMAIN program ( this is my first time )
> What is the different of WIN32/Single-thread/Multi-thread.

The second two are COM applications, the first one is a Windows Executable.

>Q.3 i try to compile with WIN32
> a error message will appear while execute
> "Cannot locate the MS Visual FoxPro support library."
> i guess i haven't something wrong, i haven't set any
> about CLASS/LIBRARY in my program.

This means you haven't installed the runtime, check out the FAQs here on what to distribute, or simply use the VFP Setup wizard.

>Q.4 i try to compile with Single/Multi
> a error message will appear while compiling.
> "Cannot buil a DLL without OLE public classes"
> i guess i haven't something wrong, i haven't set any
> about DLL/OLE in my program.

When building a COM, you need to mark at least one of your classes as OLEPublic, if you use a PRG to define your classes, simply add the olepublic to the DEFINE CLASS command. In a VCX, go to the Class info Dialog box in the class designer and find teh OLEPublic check box.