Windows Service problem

[bobisto]

I have created a windows service that watch a folder that recieve files and than reads them and inserts a row in a database. But when a folder recieve more than 10 or some times 20 it stop working. So I try to implement a Threads but now I recieve a error message when I try to start a service:
The myService service failed to start due to the following error:
The service did not respond to the start or control request in a timely fashion.