XP sys restore to infected point and M$Defender problem?

[Guest poster]

After MS Defender update, it cleared spyware(that Nod 32 left

unnoticed) ,but then dsl modem stopped working and cannot be

uninstalled(reinstalled again, because uninstall utility says it is

already uninstalled although it is there).

Restoring to some point before Defender update when modem was ok and

comparing with the registry copy after the Defender intervention(with

which tool?) would allow to remove manually the spyware key from reg

and keep the modem, provided the sys restore also restored some system

files that Defender possibly (accidentally) deleted.

What chance is the spyware will not be working without its key and how

about some other suggestions how to go about cleaning and enabling

modem(please -no deleting modem installation keys from 'clean registry/

if defender indeed cleaned it/' because it led to XP not booting at

all)

Perhaps uninstalling the modem from restored infected system(if

spyware would allow it)and then running the Defender and then trying

to reinstall dsl modem is a better idea?