Cannot access the Internet or Web browsing is slow

Reset Internet Explorer (IE) back to its default settings and clear the temporary internet files:

In IE click on Tools and then Internet Options.
Click on the Advanced tab and then click on Reset.
Tick the box next to 'Delete Personal Settings' to delete temporary internet files. Note: you will not lose your Favourites. Close and then reopen IE.
If you have another web browser installed (such as Mozilla Firefox or Google Chrome), try running that and see if you can browse the web. If you can't, then there may be connectivity problems.
If you are having problems accessing your e-mail via Outlook as well as the internet, try restarting your computer.