Hi Charlie
I will assume you have a virus protection program installed.
On my own computer, I use ESET Smart Security, which continually monitors for viruses.
99% of attacks come through emails and my virus protection program normally blocks and quarantines the virus, before it can spread into System files.
If your virus protection program did something like my example, your computer should be OK.
However, a long time ago I installed a program, which infected my computer - it started doing weird things before I realized I was infected.
If any system is infected with a virus that has already started making your computer do weird things, I would strongly recommend you do a clean install of Windows.
A clean install of Windows is the only way to guarantee complete removal of a virus.
I know it's a pain to do, but if I was you, that's exactly what I recommend you do.
When you do a Clean Install of Windows, it wipes your C-Drive clean before re-installing Windows.
Make sure to backup any data files that are on the C-Drive, before you attempt a re-install of Windows.
After installing Windows, you then will need to install some Drivers and all your programs.
I have some helpful tutorials on this topic here - they are a bit old now, but the information is still good.
www.moviestudiozen.com/free-tutorials/computers-and-windows
Last thing. I have re-installed Windows many times of the past 10 years.
Each time I did it, was because my computer started "acting up" and I couldn't work out what was causing the problem.
After doing a clean install of Windows, your computer will feel brand new again and Vegas Pro 20 will install OK.
Regards
Derek
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