Get someone who knows what they are doing to advise you. Creating a 4GB data store for a web site is not sonmething you are likely to get right without knowing about sql server. That applies to both the installation and data access.
========================================== Cursors are useful if you don't know sql. DTS can be used in a similar way. Beer is not cold and it isn't fizzy.
The SQL 2005 Express Data Sheet shows a capacity of about 4 GB, so it sounds like you'd be right there and probably should go with SQL 2000 Standard instead. Too bad, you'd have liked the price of Express...