you seem to have many problems, too many to solve in any one answer.

My bet is your computer is plagued by viruses and spyware. As you cannot download anything from the internet you need to find a friend who can download onto a CD the following programs and their updated definitions files;

A firewall - ZoneAlarm from http://www.zonelabs.com

An anti-virus program - AVG 7, free program from http://www.grisoft.com - updated definitions alsdo needed.

And an anti-adware program. Free program is Ad-Aware SE Personal from http://www.lavasoftusa.com - updated definitions needed.

And 2 spyware programs,

Spybot Search and Destroy from http://www.safer-networking.org/ - updated definitions needed.

and SpywareBlaster from http://www.javacoolsoftware.com/spywareblaster.html - updated definitions needed.

Install ZoneAlarm.

Install AVG 7, open the program and update the definitions from the CD, scan your computer for viruses.

Install Ad-Aware. Open the program and update the definitions from the CD. Scan your computer.

Install Spybot Search & Destroy - update the definitions from the CD, and scan your computer. Immunise with the definitions.

Install SpywareBlaster. Update its definitions from the CD, and click the "Enable all protection" option.

All of these anti-malware programs need to be updated and scans run regularly.

I hope this helps.

Mark