How do I fix my tired electric windows and wipers?

Recently my electric windows and windscreen wipers have started working much slower than usual. Its most noticible with the windows and it takes ages for them to open and close. I dont think its a battery problem because the car starts every time even when its lied up for over a week.
Anybody got any ideas what might be causing this and what needs to be done to fix it?
Thanks
DAN
Anybody got any ideas what might be causing this and what needs to be done to fix it?
Thanks
DAN