I guess we're just gonna have to force it then.
When in Windows, go into Folder Options and disable hiding of Hidden/System files. After that, go into My Computer and on the C drive, you should see a file called 'MSDOS.SYS'. Right-click it and uncheck the 'Read-Only' attribute. Right-click it again and choose 'Open with' and choose Notepad. Be sure to uncheck the box that says 'Always open with . . .'.
Now, you should see a line that says 'BootSafe=x', change that to a '1' and save the file. Reboot the PC and it should start in Safe Mode. To keep it from booting into Safe Mode again, just change that '1' to a '0'. you can change in Safe Mode pretty much the same way as in Windows.
EDIT - Almost forgot, if you see a line in the MSDOS.SYS file that says 'BootKeys=0', change the '0' to a '1' and the keys will work again.