File associations vanish!!

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Trying to fix daughter's PC running XP Home. Some nasty appears to
have got in and removes the associations with .lnj, .exe and .reg
files! I have managed to get them back and have run Spyware Doctor
(371 problems fixed!) and Adware but on a reboot it reappears again!
Anyone know what this nasty is and how to get rid of it please?

TIA


cheers,
Len
.



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