Integration Builder not starting

I installed sap application server(trial version) with ABAP.I could get in SAP with most of the menus but when i try to start Integration builder it tries to open explorer and then goes to home dir of sap and there i can see this error coming up

CSapInfoCtrl::GetRegValueInternal: Registry key [HKEY_LOCAL_MACHINE\ ] could not be opened.

Can someone tell me the soln for that