With the newer versions of Windows, many folks are just letting Windows Defender to the job that is part of Windows. On my XP machine at home, I use Avast. Sometimes the updates for Avast get annoying in slowing down my system. Many folks are starting to go away from Norton or Symantec. The Symantec antivirus is very complete, but seems to be a major slow-down product. With the way anti-virus works, you are really talking about a trade-off between speed and "complete" coverage. You might just try turning off the anti-virus temporarily and seeing if that is indeed the issue.
I was have problems as I mentioned with a CAD package and just started killing tasks (with the task list from the safe mode as a guide of what to definitely not kill) and found the problem went away. Unfortunately, I have not had time to go back and find which program was a problem.
It might help if you can identify what has been installed about the time you started having an issue. I assume you probably installed something as is normal as you load your new computer.
Thankyou for all the advice.
The issue seems to have been the number of fonts that I had in the Font Folder.
I installed a Font Manager and moved a large number of fonts to a managed folder and it seems to have solved the problem.
It makes sense when I think about it.
Again, thankyou everyone for your advice.
Brian