You can browse all the stuff on the web except Microsoft sites and some other security related web sites then there are high chances of your machine to be infected by Win32/Conficker A/B variant.
What is Conficker A/B/C variant ?
You can find detailed information about it on
Microsoft Protection center. In case you are already infected you will not be able to open this link, so I am reproducing detail here.
Win32/Conficker is a worm that infects other computers across a network by exploiting a vulnerability in the Windows Server service (SVCHOST.EXE). If the vulnerability is successfully exploited, it could allow remote code execution when file sharing is enabled. Depending on the specific variant, it may also spread via removable drives and by exploiting weak passwords. It disables several important system services and security products and downloads arbitrary files.
The following system changes may indicate the presence of this malware:
To make sure if your computer is infected or not please visit Conficker Test link. It is a simple logic. It tries to load images from security web sites. If your computer is infected it will not be able to load images.
Now if you are sure that your computer has been infected by Conficker A/B/C or greater, you have to use
Microsoft Malicious Software Removal Tool to remove this maleware from your machine. One more thing you have to use other machine to download this tool because if your machine is infected it will not allow Microsoft security sites to open.
I have copied images and test from
Conficker Test . I recommend to use their page only.
How to interpret:
| If you see this above: | It probably means this: |
 | = Normal/Not Infected by Conficker (or using proxy) |
 | = Possibly Infected by Conficker (C variant or greater) |
 | = Possibly Infected by Conficker A/B variant |
 | = Image loading turned off in browser? |
| Any other combination | = Poor Internet connection? |