It have slowed my computer down reasonably a bit
Answers:
What is posting up the message? Windows? Some software you own installed?
When does it appear: hit or miss? at start up? when loading a record or software? first night IE?
It could be different things, including corrupted software or OS, malware, a moment ago a pop-up poster, etc. If you can tolerate us hold more detail we should know how to assist you out.
call tech support.
Sounds similar to a spyware, run a full system scan.
at present, frequent populace are artificial by spyware, so install a fully clad one to save ur PC not dangerous