Missing Reference Help

I recently reformated my PC and copied all my programs back. But now whenever I run it it says the LEN and TRIM functions (which previously worked fine) are no good.

'Compile error. Can't find project or library.'

How do I resolve this? Thanks in advance.

Try re-installing VB, probably some of the references have got lost in the format

Go to the References dialog (in the Project menu), you have a missing reference, you must either install whatever is missing, or uncheck that reference in the dialog.