Hi
can you revert which TFTP server you are using out there ? is it a solarwinds product or 3Com TFTP ??
i would suggest to check the connectivity from the pc to the router before uploading the ios file.
make sure that you are mapping the tftp directory properly and u have the ios file in the home directory of the tftp server from where it can take the ios file .
Also finally have u checked up whether u got enough dram and flash space required for the new ios code to operate properly ?? if not i would suggest to check that out before getting onto the upgrade...
regds