The Delete VI will skip the process on its own. The simplest thing to do is to call it and ignore the error (for example by using the Clear Errors VI). Just make sure not to wire an error into it if you do this, because you will then clear that error.
As for some other tips regarding this VIs -
- Using constant paths is often a bad thing, especially if your are going to build the code into an executable and\or move it to another computer. Getting the path to the desktop is done in Windows through a special function which you can call by using the Call Library Function node, or you can hold the base path in a global.
- I suggest that unless absolutely necessary, you should not save your files to the desktop, but to another folder.
- You should create error in and out terminals, so that you can control when the VI runs.
- Giving it a less generic name is also a good idea, because LV can not hold 2 VIs with the same name in memory.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here, here, here, here and here are a few you can start with and here are some tutorial videos. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
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