try this....
have you try to delete some browsing history of your browser.... reset also your browser....
remove temporary internet file... cookies....
is your laptop connecting to a router or directly to modem... kung sa router ka connect try to open some port numbers... kung di mo makuha port number.... DMZ mo ip ng laptop mo sa router.... disable also some firewall of router...
if your laptop is connecting wireless through your router... try to hardwire it... and then disable the wireless function of your laptop... test mo kung same problem pa rin kung hardwire.... kung ok naman sa hardwire... try to change wireless setting of your router....
pde ka rin mgupdate/reflash firmware ng router mo...
hope makatulong....