Do you have an external drive to backup your data to. Also remember to backup any browser bookmarks and email if you use an email client.
Download UBCD. Burn the iso to a CD/DVD on any Windows 7 or later computer by right clicking and selecting Burn Disk Image. At the menu screen select Parted Magic. Copy the data to an external drive per the following guide.
I can't find the pdc.sys file on my Windows 7 system.
Have you tried tapping F8 and selecting Use Last Known Good Configuration?
Edit: you can also recover data by removing the drive and attaching to another computer using a USB adapter similar to this one.
Is there a legible key on a COA sticker. It could under the laptop, in the battery compartment. Don't post the key.
Edited by JohnC_21, 31 May 2017 - 11:17 AM.