Is this system using Win XP? If so, see if system restore has a restore date from before your infection started. If it does - use it.
The first thing you critically need is a working anti-virus program protecting your computer. Did you install another AV program when Norton expired?
If you have not, either pick one of the commercial AV aps that you will have to pay for, or install one of the freeware AV aps like AVG.
Many of us here think AVG is just as good as Norton, McAfee or any other of the AV programs that you must pay for.
To download AVG go here:http://www.grisoft.com/us/us_index.php
After you download and install AVG make sure all remnants of the Norton ap have been removed from your computer as if any are left they can conflict and cause problems.
The next thing to do is get an adaquate firewall. The Windows XP firewall is inadaquate as it only guards against incoming threats and not outgoing. For a firewall to be effective it must offer protection against both, otherwise you are not protected from trojans or phone home malware which can direct your computer to dial 900 numbers over your modem and run up huge phone bills.
Both of the following firewalls are freeware and will suit your needs:
Zone Alarm SE: http://www.zonealarm.com/
The next step is to download, update and run several anti-spyware programs.Anti-malware freeware
(You can run as many of these as you wish. Generally there is no conflict between these and you should always run several)
Microsoft Antispyware Beta: http://www.microsoft.com/athome/security/s...re/default.mspx
Spybot S&D: http://www.safer-networking.org/en/index.html
Microsoft Malicious Software Removal Tool (Win XP and Win 2000):http://www.microsoft.com/security/malwareremove/default.mspx
CWShredder from InterMute
CW Shredder removes some variants of spyware known as the Coolwebsearch Trojan. The Trojan takes advantage of a flaw in a key component of Windows -- Microsoft's version of the Java Virtual Machine -- to install itself via popups often found on porn and illegal software (a.k.a. "warez") sites. Run CWShredder after installing, and have it look for updates. Then click the "Fix" button, and the program will both scan and fix any problems it finds. If your system does not have this kind of spyware, it will give you the good news.
After you have done all the above there are a few web based scans that can help eliminate malware that is on your computer. Each one seems to find things the others don't so the more the better.Web based online Antivirus and anti-malware scans:
(these can be run regardless of whatever else you are using. You must use Internet Explorer to run these.)
Panda Activescan (IE only)http://www.pandasoftware.com/activescan/co...n_principal.htm
Trend Micro antivirus and malware scan:http://housecall-beta.trendmicro.com/en/st...orp.asp?id=scan
Etrust Anti-virus web scannerhttp://www3.ca.com/securityadvisor/virusinfo/scan.aspx
Kaspersky Anti-Virus Web Scannerhttp://www.kaspersky.com/service?chapter=161739400#betatest