vista will not boot into safe mode

Dell laptop Inspiron 15 with Vista Home Prem.  System had a severe virus which has been cleaned but the virus may have affected some system files.  I used an AVG Rescue Disk to clean the virus.  I can now boot to normal mode but cannot boot to safe mode.  Under normal mode, the system appears to behave correctly.  Can anyone shed some light on why I cannot boot to safe mode?  There is no error message, just a Welcome and rotating spiral.  I have run chkdks /f and the process did remove some erroneous files.  Your help is appreciated.
tonyadamRetiredAsked:
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John HurstConnect With a Mentor Business Consultant (Owner)Commented:
Open cmd.exe with Run as Administrator and at the command prompt, run SFC /SCANNOW. Let it finish and restart. This is System File Checker and replaces corrupt files. If this does not fix it, you have two options:

1. Run a Repair install if your Vista CD has that option (BACK UP first).
2. If no, then you may have to re-install the operating system (BACK UP first).

... Thinkpads_User
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tonyadamRetiredAuthor Commented:
The SFC process was not able to fix some corrupted files.  I will re-install the OS.  Thanks.
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John HurstBusiness Consultant (Owner)Commented:
Thank you. Good luck with the fresh installation. ... Thinkpads_User
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