I have Windows 7 64 bit and Windows 7 32 bit installed on 2 seperate hard drives on my computer. The 64 bit hard drive contains all my programs etc. and the other drive just basic Windows 7. For some unknown reason the 64 bit system now refuses to boot stopping at a black screen saying there is a problem with "rdyboost.sys" and to insert installation disk to repair. Repair doesn't work neither does restore and I can't use safe mode either. I can "see" the other drive when I boot into the second drive and can rescue anything I need but ideally I want the drive to boot in order to avoid a new install of 7. Any suggestions would be welcome.