Windows "semi-freezing" on startup.

[Delocaz]

Windows "semi-freezing" on startup. [Please help!]

Three weeks ago I bought a brand new Alienware X51 gaming computer (don't blame me, it was on sale!).
Just today, when I boot it up, it works fine initially, but takes an abnormally long time to start up.

After that, it freezes when I do certain things, but the mouse still moves.

What causes it to freeze (so far):

• Logging out (black screen with mouse)
• Opening the Start menu, typing something and switching to Settings mode.
• Opening the Start menu, typing something and clicking that
• And other random things

When I try to open Task Manager, it simply does nothing, no matter if I launch taskmgr.exe manually, or press Ctrl+Alt+Delete and clicking Task Manager.

The system tray thing is still empty when I click the up arrow, save for an nVidia updater.

Specs:

• Alienware X51
• Some kind of i5 (never looked really)
• GTX 660

That's about all I know.

I have a lot of important data on there (like my 500gb media collection), and my external HDD just died, so reinstalling is not an option (also, I don't have a legitimate install disc).

Please help me!

 

[Delocaz]

Can anyone help me? Please?

EDIT: Before this happened (the day before), Windows Problem Center (or whatever it's called) said something about 3 or more startup entries being added. Does this help?