i install matlab into E drive. But I also have it installed in my C drive autometically. Why? If I uninstall it from C drive it also become uninstalled from E drive. Why? My pc becomes slow after installing this software. Why?
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It sounds like E is also mapped to a path on C, likely via the SUBST command (a Windows command)
As for slowing down your PC, I can't think of a reason why that's related to MATLAB itself. It gets installed like any other program and should only be taking resources when it is started in the default installation. Or perhaps you are running low on disk space and the installation has brought you very close to having a full hard drive. But this is all speculation. I'd suggest you talk with people familiar with your system setup and troubleshoot it.
If it's slow while running MATLAB, it's possible that you need more RAM or you are running too many other programs. Look at the Task Manager to determine if you are using a lot of CPU or memory and your system has started using virtual memory, which is much slower than RAM.
In addition, MathWorks provides free installation help.
If you installed R2013a on MS Windows then you might now be running a service once that reads a number of the .m files into memory (and then releases the memory) so that the files are active in the operating system's disk cache. If you are very low on RAM that could be a problem -- especially if you have a swap file configured and your available RAM is being exceeded.
I do not know what the name of the service is (I haven't booted MS Windows for 5+ months.)