error when unzipping

When I have downloaded a file and unzip it, next message appears:

ZIP damaged: file d:\...: Bad CRC d4fcd79a (should be ed8b270e) Please press F1 for help.

Pressing F1, the next text appears:

Message WZ50

An error occurred opening, writing to, closing, or deleting the specified file.  Possible causes include a misspelled filename, a full disk, a read-only or locked disk, or a read-only or locked file.  The operation in progress will be aborted.  Another dialog box with more specific information may be displayed.
This message may also be displayed because of an invalid archive.  For example, if an archive is damaged (possibly due to line noise while downloading from a BBS) it may contain invalid pointers or corrupted header information.

I downloaded the files several times, but the same message always appears.
What do I have to do unzip my files succesfuly?

(I use WinZip version 6.2 for Windows 95)
student040597Asked:
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guardian angelCommented:
In quoting the error messages you received, you've answered the question of what could be causing the problem youself.  The CRC (cyclic redundancy check) error is telling you that the file's characteristics (most likely, size) aren't consistent with the CRC header info.  What you need to do is check the size of the original file if the information is available.  If not, your download application may tell you this while downloading.  If the file on your disk is smaller than it's supposed be, you're obviously not getting the complete archive and you'll have to keep trying until you do.  This is quite common.

If this doesn't do it, you're pretty much stuck with a corrupt archive and will have to use 'PkZipfix' to reconstruct the archive and unzip as many files from it as you can.  
'Pkzipfix.exe' is included with the DOS version of 'pkzip'.  You can get it at www.pkware.com.  

At the command prompt type: "C:\directoryOfPkzip\pkzipfix messedup.zip" (without the quotes). If this is an install program, it probably won't run correctly unless the last file in the archive was a just a text file or something unimportant.  If it's an archive of images or text files, you'll lose part of one or more files but will be able to save most of them.  Good luck.
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