by 
The Curious Bag
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<h4 class="dechead">On One Hand: The Short Answer: Yes
There are a number of viruses that can disable just about anything on your personal computer, including the Internet. In the event that you cannot connect to the Internet and have gone through comprehensive troubleshooting to ensure it's not your connection or wireless adapter, you will need access to an additional computer to download virus removal software that can be run on your infected PC.
On the Other: There Are Other Possibilities
Before spending a lot of time downloading and running Trojan removal software, be sure to go through the manual for your modem and wireless router (if applicable). The most common reasons for losing an Internet connection are not related to viruses.
Bottom Line
While several malicious viruses can prevent you from accessing the Internet, it's advisable to exhaust all other possibilities first. Reputable anti-virus protection--which all PC users should have--will keep most threats out, so be sure to keep all such software up to date.
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