First, go into Windows Explorer and find the file. Right-click the file, then select "Properties" from the drop-down menu. Be sure that, in the "Attributes" section there, the "Read only" and "Hidden" boxes are UNchecked.
Then go to your shut down menu and select "Restart in MS-DOS mode." After rebooting, you will be in a black screen, and in the upper left hand, you will see what directory you're sitting in. if it doesn't say simply "C:\>", then enter the command
cd
back slash and all. (Hit <ENTER> after every command, of course.) Then enter
dir _.ptf /s
That will show you, in "DOS language," where the file is. It should report something like "C:\WINDOWS\TEMP_F~1\_.ptf". You would go into that directory by entering
cd c:\windows\temp_f~1
(or whatever you saw in the precise path to the file). It will tell you in the upper left hand corner whether you successfully got into that directory. Once there, you can enter
del _.ptf
Then you can reboot by doing the <CTRL><ALT><DEL> thing, by hitting the reset if you have one, or by shutting down and restarting your machine. (Incidentally, it is always good to wait for about 15 seconds before starting a machine back up to allow the capacitors to clear. Just a side note.)
After it reboots into Windows, do the Scandisk and Defrag, and you should be set.
Keep us posted on what happens.
Butch
"It's what you learn after you know it all that counts"