You can delete ALL the red ones - but I would still leave them for a couple of weeks in "quarantine" till you are sure everything works fine.
I just downloaded the free version of AdAware and scanned my computer. Win98 SE IE6SP1 140 objects were found and put in quarantine. I have no idea what most of them are. Is it safe to delete them? Or should I leave them in quarantine for a while to see if they are needed?