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In my personal experience it is advisable to do scan your computers system when you have uninstalled and installed software applications.  If there did not add or change any settings it would be alright to schedule your systems check every three days.  It would be bothersome if your computer scans for possible errors every now and then.  Sometimes you should also check if your system has too much redundancy and if there are conflicting programs.  This is necessary to prevent future errors and fixing it would save you a lot of time and trouble.

Clean Windows registry is a must if you want to optimize your system performance.  It will enable your computer to process faster and efficiently without any freezing and errors.  It takes a little of your time to do a systems check.  I suggest you do it.