how can I reinstall boot manager from the recovery disk of windows without overwriting grub
Reinstall the windows boot manager from the recovery disk and then try EasyBCD which should be able to load linux or simply reinstall grub which will pick up the new windows boot loader.http://neosmart.net/EasyBCD/
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).