in reply to
PPM: Modules Dissappearing / Alternative Repositories?
If you need a convenient way to check which repositories are "alive" and add them automagically, Script to update your PPM Repositories may help you (you may need to manually remove datetime; I recall some issues with that one in the past).
As for other issues, such as installing modules on Windows, there are many helpful Tutorials to be found in the section, entitled appropriately enough, Modules: How to Create, Install, and Use.
If you need tools, you may wish to look at some of jZed's and Corion's postings (in particular) in the following threads: