✔ 最佳答案
To check error:
In Firefox, click Tools / Error and see if you can work out the fault from the report listed. Firefox is usually very reliable unless there is conflict or corrupted files in your system. This step clears doubts but it won't fix your problem. See below.
To fix:
In XP (similar in Vista & Win 7), go to control panel and run Add or remove programs. Click on Firefox then remove it. Now shut down your computer and wait 5 minutes then start again.
Start Internet explorer. Google and download Firefox 3.6.3. Install until finsihed. Again shut down computer and start after 5 minutes.
Try downloading the same material again.
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If this fails, there might be problems at the download site. To weed this out, try to download it with IE for other programs at different sites. If this also fails, check with your internet service provider for connection, line faults or security against malicious sites.