If you are on Aircel and you are getting the message
Unauthorized Request.Subscriber/Request have been barred when trying to tether (use your phone as a modem to connect to internt on your laptop or PC), it is because Aircel is blocking your internet and not a virus infecting your Laptop/PC.
All you have to do to overcome this artificial restriction placed by Aircel is change the access point to
aircelgprs.
If you have an Android phone go to
Menu > Settings > Wireless and Networks > Mobile networks > Access Point Nameshere press Menu and select Create new APN, you will get a page with lot of options to enter, most of them can be left as it appears.
Just change the name to something you can identify (I suggest "
OpenInternet") and under
APN enter
aircelgprs and leave everything else as it appears and press Menu and select Save. This will take you back to the list of access points, just ensure that OpenInternet (or whatever name you gave it) has a
green dot next to it and voila you can now use you phone to tether without restrictions.
If you have any other handset please check the manufacturer's guide on how to set up access points on your device and ensure you use
APN as
aircelgprs.
Happy Surfing ツ