when i downloaded and installed the google chrome browser from google website ,i think my pc is infected by some virus.i scanned my pc with nod32 anti virus software but it doesn’t find any virus.so i am confusing in this matter.i am note sure my pc have any viruses.please give tips to find out viruses in my pc without using anti virus softwares.
You might have spyware, but I do not think, that you have a virus.
NOD32 anti virus is one of the best there is and when it did not find any viruses, you can be asured for 99 %, that you do not have viruses.
You should do a scan with Malwarebytes antispyware.
You can download it here
http://www.download.com/SuperAntiSpyware-Free-Edition/3000-8022_4-10523889.html
http://www.download.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html
http://www.spywareterminator.com/download/download.aspx