This error is often caused be the corruption or deletion of one or all of the following windows system files; command.com, autoexec.nt and config.nt.
You may be able to rectify the error by expanding the missing files from the windows installation source, either the CD or i386 folder in the case of most OEM copies of windows XP.
Alternatively, as these missing files affect a lot of software installation packages the people at visualtour have packaged these files up to fix installation issues when these files have been deleted.
Be aware however that this problem is often caused by some form of virus, spyware or Trojan. So although restoring the files will fix the symptoms, it may not get rid of the cause or stop it from re-occurring. So it is a good idea to do a virus and spyware scan to make sure everything is clean.
The full error message you have given is slightly different to the error message I would normally expect, so I would also suggest to delete all of the files in the temp folder you have listed and clear your Temporary Internet Files before doing anything else.