You can make your own. All you need is either a USB thumb drive with at least 4GB of space or a blank DVD.
First, download the iso for the version of software you are intending. You will want to choose the same version (premium, pro, ultimate, etc) that was originally installed onto your computer.
Link to the ISO files:
http

/www.w7forums.com/threads/official-windows-7-sp1-iso-image-downloads.12325/
Keep in mind, you want to choose the correct language and bitrate... that is either x86 (for 32 bit) or x64 (for 64 bit).
Once you have that downloaded, you can now expand it onto the thumb drive, or disk. Make sure you have any important information backed up on the drive if you use it before starting as the bootable OS process will erase all data stored there.
Download the
Windows 7 USB/DVD download tool from the following link and follow the on-screen instructions.
http
/www.microsoftstore.com/store/msusa/html/pbPage.Help_Win7_usbdvd_dwnTool
----
Once the drive/ disk has been created, insert either and boot to it > enter all required information > select the "repair your computer" option > select the main disk with the OS installed > click command prompt under the recovery options.
Once at command prompt, enter the following command to begin the checkdisk procedure: chkdsk C: /r
Keep in mind, if you have multiple drives/ volumes, you will need to replace the chkdsk
C: /r with the letter of the volume your OS is installed on. If it were "D" you'd but chkdsk
D: /r, or E would be chkdsk
E: /r
Let that run its course and restart and see if that solves it.