Something to keep in mind. Firewall programs can sometimes affect your downloads. Programs like the Proximoton (a fabulous shut off goodie for popups, java, scrolling banners, flashies, sound, the works) can affect downloads. Netscape doesn't like a lot of sites, especially ones that have scripting to stop mass-DL bots. Older browser versions can cause problems. Check often for updates, patches, and bug reports. Some particularly zealous virus programs can false alert and rename or make executes unable to open if something in the file confuses it. NEVER turn your anti-virus off during downloads. Run it again when it's done, and preferably a secondary backup anti-virus as well. Norton and AVG usually work very well together. Only when you are Absolutely Sure the executable file is safe should you even think about turning them off. I'm not very fond of Win XP's built in unzipping program, so I immediately replaced it with good old classic WinZip. "Bad CRC" errors are usually spawned by a corruption of your unzipping program, either in the registry, DLLs, or etc. Try another download of the file to a new directory. If it fails again, reinstall. Redownload, deleting previous versions. If it still fails after that, and you've tried everything else on your system (virus checks, defrags, window washer, restoring to a previous setting, etc), then contact the merchant/freestuff provider.