You can also try running the application in compatibilty mode. From what I read via some Bing! searches, Tally 2.0 (or Tally ERP 9 which some called 2.0 was in beta untill a short time ago, and from some forum chats they were working on some issues
with their code to make it ready for Windows 7. Perhaps they have an updated installer for your licensed version?
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.