Delete your dbo.User_Master table and then open a new query and paste what is below. I use Abrasives registration script and this is what I did to make it work. (Been discussed and solved many times on EPVP so nothing special here...) Just delete, paste, exicute and it should work. (Also no need to delete Row ID at all. RowID is not even truly needed.)
I do suggest next time maybe doing a bit more searching on this because I found the fix here at EPVP a while back when I first started a server.
Enjoy.
(Open Spoiler to see script.)
USE [PS_UserData]
GO
/****** Object: Table [dbo].[Users_Master] Script Date: 07/08/2014 05:12:36 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Users_Master](
[RowID] [int] NULL,
[UserUID] [int] IDENTITY(1,1) NOT NULL,
[UserID] [varchar](18) NOT NULL,
[Pw] [varchar](12) NOT NULL,
[JoinDate] [smalldatetime] NOT NULL,
[Admin] [bit] NOT NULL,
[AdminLevel] [tinyint] NOT NULL,
[UseQueue] [bit] NULL,
[Status] [smallint] NULL,
[Leave] [tinyint] NULL,
[LeaveDate] [smalldatetime] NULL,
[UserType] [char](1) NOT NULL,
[UserIp] [varchar](15) NULL,
[ModiIp] [varchar](15) NULL,
[ModiDate] [datetime] NULL,
[Point] [int] NOT NULL,
[Enpassword] [char](32) NULL,
[Birth] [varchar](8) NULL,
[email] [varchar](255) NULL,
[Activation] [varchar](255) NULL,
CONSTRAINT [PK_Users_Master_1] PRIMARY KEY CLUSTERED
(
[UserUID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[Users_Master] ADD CONSTRAINT [DF_Users_Master_JoinDate] DEFAULT (getdate()) FOR [JoinDate]
GO
ALTER TABLE [dbo].[Users_Master] ADD CONSTRAINT [DF_Users_Master_Point] DEFAULT ((0)) FOR [Point]
GO