Basically, a system defrag just defrags your HDD. The standard windows system defrag is actually a pretty lousy defrag program. It is based off of a great program but does not have the advanced options.
I did some research on FREE defrag programs and found two that I really liked. (Unapproved link removed by Admin)
However, running a system defrag will not remove startup programs. (Unapproved link removed by Admin)
This program will show you what is currently running on your system. You have the option to end the startup program, but be careful when doing this. You do not want to end a program that is a system file or a standard startup program that you may have on your PC. My best friend is google, and you may type the name of the file that you are not familiar with and it will display the results of the program running.
CCleaner is more or less a basic registry cleaning tool. It will not stop startup programs from running. The other thing is that if you start your computer in standard mode, all startup programs will start. You have to identify the problem program and then eliminate the program. This is best done in safe mode if you are going to catch the bad guys, if you have trojans on your machine.
There are some free programs that you may use to help identify rootkits, and remove them as well as spyware.



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