Since you are only a day or so into a fresh system, maybe reinstall again? But take it slow in modifying anything. Do the updates required but don't go adding any modifications to the interface, wall paper, cursors or whatever. Run the stock system for a few days (not hours) and see how it goes. Of course you'll need to download Flash and stuff like that, but be careful what you add on, only essentials, if in doubt ask.
Download Firefox only and use it.
If it still acts weird from a clean system then you need to trouble shoot the hardware, starting with RAM.
If you do reinstall start a new thread for it, this one's getting long.
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