SQL Create User Script Problems

Firstly I know nothing about SQL server,I downloaded SQL express to evaluate an EAM software for work because the access version of the program was buggy.

The software came with 4 scripts to set up the database,the schema script ran fine but when I run the create user script I get a bunch of errors and have no clue how to proceed.

Here is the script followed by the error messages:

--MSSQL

-- Create Login

Use master

Go

if not exists (select * from master..syslogins where name = N'PMAINT70')

BEGIN

declare @logindb nvarchar(132), @loginlang nvarchar(132) select @logindb = N'PMAINT70', @loginlang = N'us_english'

if @logindb is null or not exists (select * from master..sysdatabases where name = @logindb)

select @logindb = N'PMaint70'

if @loginlang is null or (not exists (select * from master..syslanguages where name = @loginlang) and @loginlang <> N'us_english')

select @loginlang = @@language

exec sp_addlogin N'PMAINT70', null, @logindb, @loginlang

END

GO

sp_password Null ,'PASSWORD','PMAINT70'

Go

Use PMAINT70

Go

if not exists (select * from sysusers where name = N'PMAINT70' and uid < 16382)

EXEC sp_grantdbaccess N'PMAINT70', N'PMAINT70'

GO

exec sp_addrolemember N'db_owner', N'PMAINT70'

GO

Error Messages:

Msg 15118, Level 16, State 1, Line 1

Password validation failed. The password does not meet Windows policy requirements because it is not complex enough.

Msg 15007, Level 16, State 1, Procedure sp_password, Line 29

'PMAINT70' is not a valid login or you do not have permission.

Msg 15007, Level 16, State 1, Line 1

'PMAINT70' is not a valid login or you do not have permission.

Msg 15410, Level 11, State 1, Procedure sp_addrolemember, Line 75

User or role 'PMAINT70' does not exist in this database.

Any help would be greatly appreciated

Thanks in advance