If you are getting 'Uncorrectable data Error or Media' for your internal hard drive then it is likely that you have a disk problem rather than a software conflict caused by anything your daughter downloaded.
If the Dell diagnostics provide no solution, then you would need to use a specialist boot CD to try to repair the disk errors. One such disk is Hiren's Boot CD which can be downloaded as a CD image file (.ISO) from
http://www.hirensbootcd.org/ then would need to be burnt on to a blank CD then the laptop booted from this CD.
On the initial Hiren's boot menu, select DOS programs, then select Disk tools before selecting HDAT2 to perform the disk repair actions.
HDAT2 can take some time to complete depending on the size of your internal disk drive and the number of bad sectors or other errors encountered - the tool will attempt to repair bad sectors by reading, verifying, writing and re-reading / verifying the data.
If the disk can be recovered, then you may be lucky and the system will be able to boot but otherwise, you may still need to do some further recovery work for the operating system, in which case you may need your Windows install or recovery CD media.
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