Hey I haven't heard of this before but did it come up after you downloaded or installed a program? If so, find out which programme and associate it, otherwise, its adware and you need to run a good...
If you are running the program Spybot - Search and Destroy and DSO Exploit keeps coming up after a scan, you are not in danger, don't worry. As long as everything is up to date the DSO Exploit is not...