W32/Backdoor.KPI

Hello All
Just did my daily Netguard virus scan supplied by my ISP and up popped this
virus W32/Backdoor.KPI.
Netguard reported that it could not be disinfected but was deleted so did
another scan as per advice - nothing found.
Went into their site to see what it was and there was no trace of any info
about it.
I also got a window entitled 'Windows file protection' This said;
"Files that are required by windows to run properly have been replaced by
unrecognised versions. To maintain system stability windows must restore
the original versions of these files.
Insert your WIN XP Home SP2 CD now.
I have a screen-shot of this window and the netguard warning.
If I insert the disk, does anyone know what I can expect. Will it require
re-install of WIN XP or will the process just pick out what is required.
I thought it better to ask for advice first.
As it happens I had done a CD backup of personal stuff only an hour before.
Rgds
Antioch



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