Hello! I have a rather old Toshiba M405-S8003 that I absolutely love. I've had it for years. It started off life as an XP machine and now runs Windows 7 (32bit) very well. I use it mainly for Zbrush and Photoshop and aside from losing a part of a menu in ZBrush it runs like a champ for the most part! I can throw about 8 millions polys at before it starts to show its age. In fact, it's usually only when I render in ZBrush that things get ugly. Sadly though, the battery is kaput! Batteries are easy enough to get but I was wondering, while I'm at it- could I upgrade other parts as well? I'm absolutely going to get an SSD (that should makes things snappier) but the real question is this: If I upgrade the processor can I upgrade to Windows 7 64bit? The current chip is the Intel Core Duo T2400. I'd like to upgrade to a 64bit chip like the intel t7600. I'm considering retiring the tablet since I have a monster workstation now, but the times I've really needed to work while traveling this little laptop has been a champ! Not having to carry around a wacom tablet on a plane to work has been a life saver for some crazy deadlines. When considering the potential upgrade cost (around $300) versus getting something new I think it might be worth it if I can install a new processor that will do Windows 64bit. Thanks!