Will install of CD affect games in progress?

[Xrati]

You might be able to install the CD in a "new directory" and then 'Move' the folders to the new directory? This should only change the FAT location of those files. Which brings me to another question.

What is the security based on, file location, file dates, size, or modification?

Would disk defragging cause any problems for the security?

Would over-writing the files cause a security problem even if the OOB files were unchanged as original?

I ask, because I'd like to know. It seems like a lot of work to have to play between two installs and then remember which install is for which game!