buying a WIRELESS ROUTER

[fourtheboys96]

i bought a tp link wireless router a few weeks ago.

i configured the security setting to require a password so that only my laptop (through a linksys adapter) can access it.

now my problem is that i am having limited connectivity recently. i tried connecting the DSL modem directly to the PC and it can access the net. but if i use the router to connect to the internet, the problem occurs both for the PC and laptop.

any solution? is it in the router?