@ Russell2005
Hello and welcome to the forums!
Have you cleaned out your temp files? This might be a cause.
Take a look here:
http://www.malwarebytes.org/forums/index.p...st&p=133254 and read about the different temp cleaners available for free. Keep scrolling down the page and reading, there's about a page of replies, won't take too long to read

If this is not your problem, I am not sure what it could be, someone else should be able to step in here and help you figure this out as soon as someone is available.
Also, just as a side note,
when replying, please use the "Add reply" button at the bottom of the page or erase what the person you are replying to said, as this makes the forum easier to read.