Some time ago I purchased one of these disks from an ebay seller – as insurance, should I have problems with my system. I have not used it since I have not had any serious problems with my PC. However a colleague was given a non-working PC by a friend, having suffered problems booting (would not boot at all). I gave him a copy of the disk – he ran it on the non-working PC and reported that the PC shuffled between the CD & hard drive for ½ an hour or so – after which the PC worked fine.
As to whether such a disk would work on your friend’s PC, is a bit of an un-known – but at least you have one report of success.