Originally Posted by ridsanderson
HMMMMMMMMMMMMM strange i think virus in your computer is preventing you from pc scan i think you should install your windows again it before something bad happens to you system
This would be killing the installation, to prevent it from dying.
If trying to remove the treat, you have a chance to save your data, while a reinstallation leaves no chance of saving any data.
There have been several vira that attempts to prevent scanning, but only a few, - if any, have been able to disable all scanning programs.
If the virus ends up with directly damaging the system, then a reinstallation would be necessary, but a reinstallation should never be first priority.
When that is said: If you have no important data on your computer that needs to be saved, you can just as well reinstall right away.