Windows XP Professional limitations

Greetings and salutations fellows! I have been researching on this operating system from many perspectives from its developers to its users and have not been able to have a rough gauge on its limitations about its figures and numbers according to its maximum value supporting protocols. My question is that "Does Windows XP Professional Edition Service Pack 3 on a P4 2.4 GHz 4 GB RAM with 80 GB PATA HDD {windows installed on PATA Drive} and 2 TB SATA HDD has any limitations on the number of an average of 200 MB softwares or programs that can be installed on the system before it starts to overload or slow down. I know it depends on a lot of factors but I need someone to humor me in a hypothetical situation; just wanted to know how many programs i can install because i use a lot of programs, is there a limit to the number of programs? my desktop is slowing down so i need to know whether it depends on the size of the windows folder or the registry entries. My windows folder is 12 GB and there are no errors or viruses; i have done all of the maintenance and optimization services, but my torrent has suddenly started malfunctioning by giving a definite or absolute memory leak with the hard disk slinging and thrashing, so if there is an experienced person out there, you're help would be greatly acknowledged, thank you. :D
 
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