solution 1 ; inserting windows installation disc, then system recovery environment (small text left hand corner of the screen) , use system restore and select most recent restore point.
solution 2 ; create a fully functional bootable windows OS with either windows to go or the easier one PWBoot. this way you can interact with the drive containing your original Windows, attach a external HDD or USB stick to recover your data. please note# downloadable ISO for use with PW-boot http://www.techverse.net/download-windows-7-iso-x86-x64-microsofts-official-servers/ . (no installation required on HDD)
here is a guide for using PW-boot ; http://www.nextofwindows.com/how-to-easily-install-windows-7-8-onto-an-external-usb-storage-with-pwboot/...