Could be connected to recycle bin and/or windows temp folder. A friend had a similar problem which, funnily enough, was cleared by Window Washer and a cold boot. As to the exact cause, I do not know, especially after reading the steps you have taken so far. Which version of Ghost are you using? Version 9.0 should be all right, but any version using PC DOS might have a problem with a 200Gb HDD.