DHCP problem? Can’t connect to Internet, and wireless router….

I have 2 computers, one desktop that’s hardwired to a linksys wireless router and a laptop that access it wirelessly

Lately my computer hasn’t been able to connect to the router, but my laptop has been working just fine (internet and can access the router)

So I assigned a static IP to my desktop and it now can now ping the router and my laptop, but I still have no internet in my desktop.

I read somewhere that if this happens I might have a problem with the DHCP server…. Thing is I don’t know how to access it and how to trouble shoot it…

thanks for your help