Hi,
I have another clue about what could have caused this problem. As i mentioned in my very first posting, the virus files did not update after 6th June. I was in Sweden till that time where the internet connection was not through a proxy server. However, from 7th June onwards i am using a internet connection which passes through a proxy server.
In FAQs of McAfee technical support, i found this relevant page
http://service.mcafee.com/FAQDocument.aspx?lc=3081&id=TS100291 Could my problem be that the McAfee is not able to download the DAT files due to proxy? Please note that i am using google chrome and internet explorer 8; i have set the proxy authentication password saved in both the browsers. I gathered from your reply that McAfee uses IE for connecting to internet.
Hope this is a right clue to solve my problem.
Anil