Copy your personal stuff to another storage device and then use a secure delete program. My antivirus program has a secure delete function, as does CCleaner.
Today I am getting a new xps 8950 computer which will replace my xps 8940 broken computer. I do not want to return the 9040 with the original SSD that has personal info on it. So I thought that I could just return it with a new onboard SSD that I have just purchased.  I am wondering if this would suit since the old computer has to have repairs done to it anyway? Michael 
Returning the original SSD or a replacement SSD