It could be something running in the background that's chewing up resources, causing the momentary freezes. Open your task manager and take a look at the processes that are running and make note of CPU usage. With no programs open most should be dedicated to System Idle Process (98-99%). Scan your computer and cleanse it of any of that bad stuff that makes computers perform terribly.
Ad-Aware SE, Spybot Search & Destroy, a reputable virus scanner, CCleaner, and HiJack This are just some of many tools you can use to check your computer. If these programs don't help, then it's time to explore hardware trouble.
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