My browser (opera) shows some XX KBs as size for each page. But, after I download a page, If I compare the total data downloaded which is shown in the network monitor software (in this case 'Net Meter'), then it does not match the total of the page as shown by opera. For example, if NetMeter shows 250 KBs download and 30 KBs upload, opera shows some 120 KBs as the page size. Does this mean that some virus or spyware is in my machine? Data downloads shown in Netmeter is always double the page size shown in opera.When no page is downloading at all, even at that time, Net Meter shows data transfer, but in the order of 1 or 2 kilobits/sec. Is there a problem in the machine or am I wrong somewhere. What should I do. Please help.