Instead of using Timers, use Threads.
EDIT =============================
For an example, go to this article page:
http://www.codeproject.com/script/Articles/ViewDownloads.aspx?aid=240517[
^]
Look for the
ReputationScraper
, and open the file RepScraperSvc.cs file. It illustrates a scheduling thread. You will need two of them. As far as making threading work for you, google is your friend, and there are a lot of articles here on CP about it.