Problem uninstalling SQL Server Management Studio

I had problems with SQL Server and i uninstalled/reinstalled a lot of things and tools of it. Now, SQL Server works, but the Management studio doesnt.

When i execute it i have 开发者_高级运维the follow error: "Object reference not set to an instance of an object". And i cant do any query...

I tried to remove it and reinstall, but in the installation center i cant check management tools to remove it... it appear disabled. I cant uninstall it and also i cant reinstall it.

What can i do?

Quick and dirty solution: if you use SQL Server 2008, install SQL Server 2008 R2 side-by-side and use ssms from it.