The first one is a sales site. That one should be removed for sure.
The second one is an advertisement for services, which should probably be removed.
You're welcome to put them in your profile, but putting them in your signature is basically SPAM for everyone that sees your posts.
Here's a quote from the Terms of Use: Advertisements, chain letters, pyramid schemes and other commercial solicitations are inappropriate on the Forums. http://www.tomshardware.com/terms.html