lpsolve errors when attempting to run

I am trying to use lpsolve for optimisation in MS Visual C++ 2010. However, I have attempted to follow the instructions on linking the libraries but I still get errors when trying to run the demo available on the lpsolve site.

• I am on a 64-bit system, but I can only make a console 32 application in VS2010
• I have placed the lpsolve55.dll in both System32 and SysWOW64
• I have put all the header files in C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include
• I have put all the library files and the dll in C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\lib
• In the project preferences, linker, additional dependencies I have listed lpsolve55.lib

Using the win32 lpsolve archive, The demo compiles, but then throws the following error as soon as it runs: "Unhandled exception at 0x77b98e19 in lpsolveDEMO.exe: 0xC0000005: Access violation writing location 0x00000014."

I have no experience adding libraries or using any really other than the stdio library. Any help would be greatly appreciated, or any suggestions for more straightforward to use linear optimisation libraries as I can't find any tutorial on lpsolve other than this demo that doesn't work