If there is nothing else on the machine that is HP related, why not?
Files in Temp folders can be deleted anyway. That's what they are, temp. Software creators are very lax in cleaning out the guff they put in Temp folders, and so we have to do it for them.
I'm not sure what the problem is.
xp pro. emachines 2.3 celeron 768 ddr ram, old compaq 30 gig hd. had a hp scanner copier etc. uninstalled and gave away. now i have tgis 870 Mb file in a temp folder that is hp webrelease. can i just deleted this folder and be done with it?