Hello. I bought a Microsoft Wireless Desktop 700 just 6 weeks ago (comes with a wireless mouse and keyboard) and I have to keep changing the 2 AAA mouse batteries every a week or so. What is going on? Is it because I leave my computer on 24/7? Because I have noticed even when it is off, the mouse is on. Plus, I haven't changed the 2 AA keyboard batteries since I got the keyboard. The kit is absolutely great, except for the fact that I have to buy 2 AAA batteries (2 dollars) every week. Could anyone help me? Thanks.