Hi i insttalled the free trial 3O days MacScan on OsX10.5 is it normal that for full scaning it takes so long time more even than one day?! on the other hand this application hasn't any uninstaller on image disc ,so how can i uninstal it from my hard?

Depends how fast the computer is. But, yes, it takes forever. And besides it's worthless junk. (If you want any A-V, get Sophos instead.) In order to uninstall, here's where all the files are. Basically just drag the app, underlined below, to the Trash. Do the others if you want, but they aren't very important.

/Users/yourusername/Library/Preferences/MacScan Statistics.plist

/Users/yourusername/Library/Preferences/com.securemac.MacScan.plist

/Applications/MacScan 2/MacScan.app

Get rid of the tracking cookies. They are used to profile and track your browsing history. While they are privacy invading, by calling them spyware, MacScan is being a little dramatic in trying to sell you its crap. And in the future, for whatever browser you use, don't allow third-party cookies.

To prevent tracking, get Ghostery. In addition to having Ghostery and forbidding third-party cookies, I clear out all cookies from one browsing session to another. If you always do that, you won't have any tracking cookies to worry about, so you won't need MacScan to find them for you. Btw, MacScan finds the tracking cookies in the first few minutes of scanning; if you want to use it for that, then that's all the time you need to run it for. But, as I said, you won't have any tracking cookies around if you just remove all cookies and don't allow third-party cookies. As soon as you visit a site that needs them, you'll just get new ones. No problem.

Read all about cookies here.

http://en.wikipedia.org/wiki/HTTP_cookie

If they're there, they should be in your home folder Library/Preferences.

About the username it seems that isn't absolutely necessary,isn't it?

Your user name just means it's in your user, the home folder of your account.

I think you're making a big deal out of something that isn't worth it. MacScan, at least the demo, and probably the paid version as well, doesn't install anything you need to be very concerned about. Just trash the app and get the files you can, and that's that. Anything you happen to leave around won't take up any space and will just sit there doing nothing.

All you have to do:

To uninstall and remove MacScan from your system simply drag the "MacScan 2" folder, located in the Applications folder by default, to the Trash.

http://macscan.securemac.com/support/index.php?pg=kb.page&id=15