Thank you Cluberti - I will now leave that tree alone! Being a bit of a numbskull when it comes to the inner workings of Windows, I don't know what EFS is but I guess I don't really need to know. My major problems with IE7 is that, on some pages I get the little "Error on page" message in the bottom left hand corner of the page on many websites and on some, mainly secure sites I've noticed, some links will not work - in particular links to make payments with PayPal or the link to my account on my bank website. Sometimes I also get the Script error box come up but with no details and the only way I can get rid of it is to close the webpage with Task Manager. I have disabled script debugging and notification of script errors but it doesn't make any difference. I think I may have a serious problem with Windows XP because when I try to validate my version of windows, the validation program cannot supply me with a code. I have validated numerous times in the past without a problem. I have also lost System Restore and the Search function. Anyway, thank you for your reply it is very much appreciated.