One of the biggest culprits of the demise of modern PCs is the fragmentation of the registry and hard drive, I will not go into the whys of the matter as it will take too long to explain. Suffice it to say that the next thing you should do is to download and install a PC cleaner called CCleaner, which coincidentally is free at
www.piriform.com/ccleaner. CCleaner is the leading PC maintenance software and will take care of the problems that are plaguing you. My PC is a year and a half and runs like its new because of CCleaner.