If you are looking for a good paid for anti-spyware program which runs in the background protecting your computer(And you should), here are three excellent ones for you to consider:

MBAM

SuperAnti-Spyware

CounterSpy

Either one of the three paid for anti-spyware programs above work very well with SpyBot S&D 1.5, coupled with a good anti-virus program(Paid for or free) will go a long way in helping to keep your computer malware free, but programs are not fool proof as new malware is being written on a daily basis. It is dangerous out there on the internet these days.


Three really good and free anti-virus programs are:
(You only need one anti-virus program as two or more will cause significant problems on your computer)

Avira

Avast 4.8.1201

PC Tools


6. Consider increasing your browser security by using Spyware Blaster:
SpywareBlaster will increase browser protection by blocking Thousands of known malware sites by adding them to IE's restricted sites zone. Download it here:

SpywareBlaster


If you use SpywareBlaster, you can also use a customblocklist to add even more entries into IE restricted sites zone. Go to this site for the current list and how to use instructions: CJB.NET


IE-SPYAD is similar in that it adds thousands more known malware sites to IE's restricted zone. Download it here:
https://netfiles.uiuc.edu/ehowes/www/resource.htm


Block access to Untrustworthy Sites

You can prevent your computer from visiting a myriad of untrustworthy sites and ad-servers by installing a customised hosts file. One of the best available is the: MVPS Hosts File. Simply follow the instructions to install the file in the correct location. This will not only make surfing safer but will improve website load times and block popups from many of the large ad-servers.

Just in case you were interested... it transpired that the popup window was caused by a trial version of Ulead Video Studio running out and it being incompatible with AVG - I found out when searching for the popup message on Google. It's been a problem for a few people, not just me, and seems to have gone now I've removed the installation of Video Studio... the things that happen when you need to do lots of different things with the same PC! Thanks for your time. Jenny