Cannot select: File sharing/MS network cleint

The issue in my other post is resolved (thanks alot), but got another issue:

After re-wiring the cables to my router, now I can see the router from my computers and eveything, and it is working fine (as a local network).

BUT still I cannot share, and looks like the reason is the laptop: When I view the properties of my wirless connection in my laptop, it lists the usual four elements:
1-MS Network Client (or something like this)
2-File and printer sharing (service)
3-QoS
4-TCP/IP (where the IP is set to automatically obtain)

The thing is I cannot select the first two elements, I see them, but they are UNCHECKED, even if I check them, it gives a message saying that they will be unchecked.
What could be causing this? This is the first time this happens. My PC is working fine, and all 4 elements are checked. My laptop is not.

What could be a solution for this...

Thanks in advance...