I accidentally deleted all the files inside Quicktime, and now when I try to import to iMovie it won't let me...how do I fix this?

How do I get them back? It's from the Quicktime that already came with my Mac...please help me...It won't let me import movies to iMovie!!

What installer software package files? Could you tell me how to get there?
Afraid I'm not a mind reader. You have to download the installer packages from whatever source provides those installer packages. For instance, you would download the DivX installer package file from DivX. The Perian codec installer package would found at the Perian web site. QT "Pro" codec components installers may be include with older Motion or FCP Suite software or from the Apple site, etc., etc., etc. At this point all I know for sure is that that you have part of the DivX package installed and should reinstall the entire package if you plan to use it for anything.
Everyone's codec component configuration may be different depending on what codecs the need to use. Perhaps it would be easier if I provide an image showing the codec components installed on my Snow Leopard configured laptop:
This is a very basic set-up since I do most of my video work on my iMac which has FCP installed on it. In this case you can see:
a) AC3MovieImport.component (Apple)
b) AppleIntermediaCodec.component (Apple)
c) AppleMPEG2Codec.component (Apple)
d) Elgato Turbo.component (Elgato)
e) EyeTV MPEG Support.component (Elgato)
f) Flip4Mac WMV Advanced.component (Telestream)
g) Flip4Mac WMV Export.component (Telestream)
h) Flip4Mac WMV Import.component (Telestream)
i) Perian.component (Perian)
j) x264Encoder.component (MacUpdate)
The first three codecs were installed by my System Installer w/iMovie package (i.e., pre-installed on system when purchased or added afterwards by iMovie). The Elgato codec installers came with with my Turbo H.264 and EyeTV hardware devices. (I you don't have such devices, then you don't needcan't use these codecs.) The WMV codecs were purchased from Telestream. The Perian codec was a free download from the Perian web site and is used for DivX, XviD, 3ivX, DTS, AC3, MKV, FLV, and other audio/video/file type support. (I.e., I don't use the DivX package.) The X.264 codec is a leftover from my old Leopard system and not really used much anymore since I now prefer using HandBrake GUI for most X.264 custom encodes.
At this point, would assume you need to rerun the Snow Leopard/iMovie Installer if you purchased the system with system pre-installed or purchased the it as a system upgrade. Another alternative would be to find another Snow Leopard OS platform and simply copy the missing Apple iMovie codecs from a working system to your non-working system. All other codecs are up to you. Only you know what third-party codecs were installed on your system. And if you don't remember, you will probably find out what you are missing every time you try to play a video containing an unsupported codec.
Since you seem to be very inexperienced here, you may wish to consider joining a local user group or seeking some one-on-one assistance from someone in your local area.

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