I'm guessing you mean "sign up" rather than "sign into"? Ya, you do need an Apple product to sign up for this Apple Service. You don't need a mac for it. You can also use an ipod/iphone/ipad if they're running the right iOS. If you don't own any Apple products, then you really have little use for iCloud to begin with... so not sure the problem. If you do sign up on one of those other devices, or have someone do it for you on their Apple product, you can get the control panel for your PC here: http://support.apple.com/kb/DL1455
I see you going to various threads just ******** and complaining. I see you haven't started any threads. Did you have an issue you'd like troubleshooted? Why don't you create your own thread and outline the issue, in the appropriate forum, so someone an try to help you?
Sorry for the thread hi-jack. Just saying...