POS Software

Hi Coders, I am looking to get a POS(Point Of Sale) Software developed. That I can use for my Retail Store(s). Basic requirements are: > Ringing up sales > Inventory management > Credit Card Processing Also it should be able to work on > Most Windows Machines (XP, 7 and 8 dont worry about Vista!) > Any(Most) of the Hardware should work with software as long as Drivers are properly Installed. Hardware: - Thermal Printer - Cash Drawer (operates via Thermal Printer in 99.99% cases) - USB Barcode Scanner (Scan Barcode Products) - USB Pole Display (Display sales prices and stuff to Customers) - USB Credit Card scanner - Touch Screen Monitor > Database should be saved in MS Excel format(not necessary but I think very easy to access via different applications or can be modified easily) > Also this way I can used Database from One System to another. > Software should be smart enough to keep track of inventory. Should figure avg ssales per week/month/yr of products. > Should suggest what to buy and stuff like that. Well there are bunch of other stuff we can discuss later once we start working on the project. Ask as many questions as you want. Visit this website to get idea of what POS system is. This software is only $200 but its too buggy. That the whole reason I want to create my own. it installs easliy on XP but on Win7 they have to log into my computer and do stuff, which I totally hate. Any way it is : <[login to view URL]> * Once we achieve this Goal we can continue advancing software,like - Android / iOS app that can access/modify data