I am unable to connect my GT-B7722 mobile to PC by Kies using win 7

I also experienced the same problem with my Samsung F480v. Samsung studios are not stable for all samsung phones. Some could work for a selected brand, unlike nokia. I suggest you follow this link, and download Samsung PC Studio 7 : http://www.brothersoft.com/downloads/samsung-pc-studio.html
Download it and install. Hope this helped.

First download the dotnet freame work latest and install it
you may use this link
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992&displaylang=en



then download the latest kise software from this link
http://www.samsung.com/in/support/detail/supportPrdDetail.do?menu=SP01&prd_ia_cd=1903&prd_mdl_cd=GT-B7722QKAINU&prd_mdl_name=GT-B7722&srchword=GT-B7722

then try it will work other wise contact me