Welcome to Sevenforums from me as well, Ian!
In Computer, do the harddrive(s) appear to be near/at max capacity? Sometimes malware can cause problems in this area. Perform a full scan with your updated antivirus software. If you would like an extra backup in this area, try out Malwarebytes free in addition to your antivirus program. It can perform a manual full scan that is quite good: Malwarebytes : Thank you!
If you are only having this trouble with internet explorer, try resetting it. Internet options>Advanced tab>Reset. You can unmark the box that deletes your personal data so that you keep all your favorites, etc.