Windows 7 is slow (aeroview, start menu, right click desktop, etc) but randomly works fine for a few

Out of nowhere the startmenu, hovering over objects on the taskbar, right clicking desktop to menu, using task manager: all of these are now very slow. The thing is periodically it will run fine even though I have the same number of applications running and haven't really changed anything. Everything else runs fast, it's just the windows interface that is slow.

I am on an Asus UL80Vt notebook.

Thanks for anyone who can help. I am new to windows 7.

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