1)i want to block some websites in stanalone win 2000 using IE help me Out
2)how to restrict logon hours or net access

Net Nanny for a program like that. Most of them are not too expensive. Or you can do it using Group Policy's (but is for advanced users)

Here's a tutorial in adding sites to the Block list:
How to Restrict Web Browsing Using Internet Explorer - wikiHow (http://www.wikihow.com/Restrict-Web-Browsing-Using-Internet-Explorer)

To set time limits you can use K9's free program: Download Software - K9 Web Protection - Free Internet Filter and Parental Control Software (http://www1.k9webprotection.com/getk9/download-software.php)