It may not be a problem on your side. Sometimes, it's prefectly normal. Sometimes, it's a sign that a web site have been hijacked. In some cases, it's a DNS that have been poisoned.
In all of those cases, there is nothing that you can do, as your computer is not implied in the redirection.
Can you give an address that get redirected?
Kualinar
March 2010
Recommend you run antivirus and antispyware scans. If you don't have them get and run Superantispyware and Anti-Malware. Both great products that have free versions. If those don't fix it download Hijackthis. You will save the log it generates and post it to a website. BleepingComputer.com is a good one. Someone there will walk you through what you need to do to fix it. May take awhile until someone gets around to posting a reply though.
Billreyn
February 2010
Automatic Answer
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Try fixfault.com to fix desktop pcs.