The text problem is fixed, shockwave flash works again and the MS malicious software removal tool completed a full scan :-)
Excellent news! 
Many thanks for your help.
You are quite welcome! The pleasure was mine 
I have installed Avast free, my intinal reaction is that it is easy to install and use (but Web Shield did not get on well with windows firewall).
Yes, the Vista F/W seems to be a common complaint. Now this is just me and not a recommendation, but I don't invoke an OS F/W at my house. I do though, have a router nest and that is essentially is a Firewall. It used to be that nefarious actions occurred on all sorts of odd port addresses and a F/W shored all that up. Now, the bad guys can do their worst via Ports 80 and 443. Can't really block those or the Internet becomes a fairly uninteresting experience. I think if you make sure everything is patching and updated, practice safe computing (no P2P, no nefarious sites, etc.) use caution when opening attachments in email, etc. you should be in good shape. I'll add some further recommendations below.
I think I will leave Norton, this is the seccond time in many years that I have used norton and although it did cost some cash, (and this may just be my impression) it again has come across as resourse heavy and, well just a bit to "difficult".
I never want to be the one that makes that conclusion, but you've come to the same conclusion that many others have. It's upsetting as you've paid for the product. However, its not serving you well, so I think you're quite right in moving on.
Ok, I'm going to post my finish up text. However, I'll leave the topic open for a few days in case you have some questions. Also, I did not have you run MalwareBytes scanner, however, the instructions are below. It's a great tool to use and to hang onto. It will always find small items; tracking cookies, etc., so only be alarmed if it finds large issues feel free to ping me with questions.
Last...sorry to keep pounding on this, the majors threat vectors are as follows, Java, Adobe, OS updates, Word and Excel updates. Make sure you always keep these up to date.
Again, it's been a pleasure! Please stop back if you need anything

Preventing Re-Infection
An ounce of prevention is better than a pound of cure, so, I have listed some tips for you to stay safe on the internet in the future.
WARNING!: Java is the #1 exploited program at this time. The Department of Homeland Security recommends that computer users disable Java. Have a look at this article.
I would recommend that you completely uninstall Java unless you need it to run an important software. In that instance I would recommend that you disable Java in your browsers until you need it for that software and then enable it. (See How to diasble Java in your web browser and How to unplug Java from the browser)
If you still want to keep Java
- Click the Start button
- Click Control Panel
- Double Click Java - Looks like a coffee cup. You may have to switch to Classical View on the upper left of the Control Panel to see it.
- Click the Update tab
- Click Update Now
- Allow any updates to be downloaded and installed
- Warning!: Make sure to uncheck Optional offer box when downloading Java or you will install an adware on your computer.
Adobe products have to always be updated, because they also are being used to infect your computer.
- If you want to update Adobe Flash Player, visit this site.
- If you want to update Adobe Reader, visit this site.
- Warning!: Make sure to uncheck Optional offer box when downloading Adobe products or you will install an adware on your computer.
Turning on Automatic Updates is a crucial security measure. Keeping them out-of-date is like begging to get your system infected.
- Click Start > Control Panel > System and Security > Windows Update
- Under Windows Update click Turn automatic updating on or off
- Make sure that your settings are set so that you will receive updates automatically and click OK.
FileHippo is one of programs that can check for out-of-date programs on your computer. You can get it here
Recommendations for security programs
- Malwarebytes' Anti-Malware is a new and powerful anti-malware tool. It is totally free but for real-time protection you will have to pay a small one-time fee.
- WinPatrol as a robust security monitor, will alert you to hijackings, malware attacks and critical changes made to your computer without your permission. WinPatrol takes a snapshot of your critical system resources and alerts you to any changes that may occur without your knowledge.
For some good tips about how to prevent infection in the future, visit this site.