Welcome Jayesh, I upgraded from XP Pro to Windows 7 Ultimate X64 and had only one program fail to run on the X64 system. My printer and scanner are 4+years old but the makers had drivers
to run them in Windows 7, although with reduced options. There are also many which will run just fine in Compatibility mode for XP.
That Windows 7 Compatibility
mentioned will tell you about anything that will not work and what hardware will need newer drivers.
Another option for you would be to upgrade to Windows 7 Pro or Ultimate then you can use XP mode, a free download from Microsoft. Then any XP programs can be used from within Win 7 as if they are native but would actually be in a virtual machine in XP mode.