1. What three firms are the leading ISP's in Tirana, Europe.

Hello tonyi

Tirana, as you may already know, is the capital of Albania, a
sovereign country in Southern Europe.

I found the following companies offering Internet Service provision in
Albania, which naturally would cover Tirana, the capital:

Abbisnet - Albanian internet service provider -
http://www.abissnet.com.al/English/index.htm
ADA Net - An internet service provider in Tirana. Also offers broad
band (leased lines) and microwave connection to the internet -
http://www.albnet.net/
Albania Business Communication - A full-service ISP in Albania with a
directory of Albanian web sites - http://www.abcom-al.com/
Albania Online Internet Services - Albania Online offers monthly and
prepaid internet accounts, temporary visitor accounts, and internet
services for companies and institutions -
http://www.albaniaonline.net/
Albanian Data Network - Internet service provider for the public and
corporate clients. High-speed dedicated lines. Other services include
web hosting, page design, computer setup and configuration -
http://www.adn.net.al/

Source:  The Open Directory -
http://dmoz.org/Regional/Europe/Albania/Business_and_Economy/Computers_and_Internet/Internet/Internet_Service_Providers/

You may also find the following websites useful:

http://www.ceenet.org/database/country/albania.htm  (Be aware info
quoted here is dated January 2000)
http://www.state.gov/www/background_notes/albania_9903_bgn.html
http://www.albanian.com/

Hope that helps!