Default Compatibility problems

Compatibility problems.
I hace lost complete access to the contacts database and even sometimes problems to call or receive calls.
I can't access to the list of contacts.
I have installed contacts+ and other utilities to try to solve the problem.
I think is because i installed some perturbing or incompatible app.
I would like to know if i can disable an application without uninstall because I would like to observ the behaviour of the application in interaction and after decide if i uninstall definitively or not....

Best Regards.

P.D. I observ I can unhabilited some predetermined apps i can't uninstall.....

Will I lose the data if I uninstall a recording phone application ?. Have I to download again from Play google the uninstalled app ?