To turn on the cookies:
For Internet Explorer 6.0: Tools--> Internet Options--> Privacy--> Advanced--> Check 'Override automatic cookie handling' & Select 'Accept' for First - party cookies.
For Internet Explorer 5.0: Tools--> Internet Options--> Security--> Internet--> Custom Level--> Scroll down to Cookies and enable the function.
Please close the browser & login again after turning on your browser's cookies function.