Windows OCR Service

We are looking to have someone write in VB.Net using MS VB Express Edition 2005 or later a windows service that will look in a configurable "Hit" folder and OCR any documents (pdf's jpg's) put in there. We have the API's to the OCR vendor. Once the file is OCR'd it will integrate into one of 2 document management systems that have their own API. The software will need to read (using the OCR BarCode API) the Bar code in front of the document and then decide where to place the document in the Doc Mgmt System (using it's API). The service will need to have a configurable user interface. This is for Windows XP, Windows 2003 Server. We expect it in VB.Net and we will review the code using VB2--5 Express Edition. We have the API's to the Document Management System and the OCR system