Does the msconfig.exe file exist in your system? If so, your system may be
infected.
Try to run Regedit also. If it acts the same way then you can be fairly certain
of an infected system. This behavior is typical of more than one virus/worm,
some of which may even neuter your present AV app.
Try one of these free on-line scanners to double-check your system.
For viruses, start with Trend Micro’s Sysclean. Download it and the
signature file. Turn off system restore, boot into safe mode and run
sysclean. Boot back into normal mode and run a full AV scan with your
normal AV program. Then turn system restore back on.
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