Can't see SQLExpress in Services

I installed everything that i need with No issue but i cant see SQLExpress in Services list and i cant open the SambaPos ( cant connect the db). Could you please help?

I also installed SqlExpress 2008 R2 but i cant see it in the Services list. Lütfen yardım…

You can refer to below link and check your configuration.

Should i uninstall 2008 before installing sql2012?

yes, i would recommend uninstall 2008. You can install sql 2012 or latest sql 2014. just follow same process/steps . sql 2014 is avaialble from below link.

ExpressAndTools 32BIT\SQLEXPRWT_x86_ENU.exe - for 32Bit operating system
ExpressAndTools 64BIT\SQLEXPRWT_x64_ENU.exe - For 64Bit Operating system