That is how they suck you in to take your money.
Free scan but pay to fix it.
Just stay away from all the "Free" online scan to check your drivers or for virus's etc.
Some will steal all your personal data off your PC or install virus/trojans on your PC to do so.
If your PC is working right then you don't need anything fixed.
If your having a problem then you came to the right place for FREE help. Whatever antivirus software you are using be sure to run a full scan now to make sure something wasn't added by the driver checker already. Then if your having a problem please post what is happening. Mike