You need to download this file to a floppy then unzip it. start the computer in dos mode.
Start tapping F8 when you turn the computer on. On the screen pick (5) command prompt only.
C:>cd windows\system enter
c:\windows\system>rename comctl32.dll comctl32.old enter
put the floppy with the unzipped comctl32.dll in to the A: drive
C:\windows\system> A: enter
A:>copy *.* c: enter
C:\windows\system>dir comctl32.dll enter
you should get a listing of 1 file. If yes the reboot if not retrace and make sure of your spelling.
If you want when you rename the file to old then you can check by C:\windows\system>dir comctl32.old enter this should list the file as old. If you make a mistake and can't work out what went wrong it is most likley in your spelling. we can always rename the old back again.