One Computer No Longer Recgonizes My Toshiba Canvio Portable 500 GB Hard Drive

Hello. I have a Toshiba Canvio Portable 500 GB Hard Drive. I used it to back up my files on my main computer and connected it to that computer every now and again to download more files. Suddenly, it stopped being recognized by my main computer a while back. Or more accurately, my main computer recognizes it but says that it needs to be formated before it can be used. I have not idea what happened to it. Oddly, the hard drive is recognized by all of my other computers (a MAC, a Chromebook and a standard PC Laptop) and I can access the files on there using those computers.  I have never used any of the other computers to download files. Is there a way to figure out how to get my main computer to recognize the hard drive again without reformatting it? I'd like to add more files from that computer to it. Thanks for the help. (I recently reinstalled windows and the drives for the hard drive on my main computer and still no luck.)

If you can get the 2008 started move large libraries such as  your iPhoto, iMovie and iTunes libraries to an External HD. Once you have verified the libraries have been successfully moved then Trash the ones on the internal HD and empty the Trash. Once these operations have been done then use:
iPhoto: How to move the Library to an EHD
iMovie: How to move the Library to an EHD
iTunes: How to move the library to an EHD

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