Sometimes I'm not able to see the content of an exe file throught a disassembler or a debugger. If I load the file inside ida I get a series of lines like the one below:
seg000:0040xxxx db ? ;

I get the same result using Ollydbg.

Does it mean the pe header is slightly modified? How can I solve the problem?

That means there is no memory allocated at that virtual address.

in ollydbg right click-analyze code or remove analisys? one of the options can make the code visible.

Ricardo Narvaja