Which version is use of c plus plus in window7?

No. You have to jump through a great many hoops just to get it running on Vista. On Windows 7 you can, at best, install the baseline system but you won't be able to apply any of the service packs, rendering the entire package obsolete. Bear in mind that VC++ 6.0 was released in June 1998 and has gone through six major updates since. Moreover, Windows NT4 has been updated five times (Windows 2000, Windows XP, Windows Vista, Windows 7 and now Windows 8) not counting the server editions. If you want to stick with VC++ 6.0 then you'll need to install Windows XP within a virtual machine and target your programs towards the XP platform. However, if you want to write programs for Windows 7 or 8, upgrading your IDE is long overdue. At 15 years old, I think you've had your money's worth.