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As suggested to you, I would like to second the advice to restore your system to an earlier restore point.
RESTORE TO A PREVIOUS SYSTEM RESTORE POINT
WIN | type SYSTEM RESTORE |ENTER | NEXT |
check Show more restore points (lower left)|
Highlight the desired restore point |
Scan for affected programs (lower right) |
make a note of affected programs |
CLOSE | NEXT | FINISH
WIN is the key with the wavy Microsoft flag on top.