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Try clearing old files and settings;
Click on Tools.
Select Internet Options.
Click the General tab.
Click the Delete Files button.
When the box opens, put a check in Delete All Offline Content.
Click Delete Cookies. When you are prompted to confirm this selection, click Okay.
Click View Objects.
Click View, and then click Details.
If Damaged appears in the Status column for any program file, remove that program file.
Close the Downloaded Program Files dialog box.
In the Settings dialog box, click OK .
Under History, click Clear History, and then click Yes when you are prompted to confirm the selection.
In the Internet Options dialog box, click Okay.
Then have a look through the Topic: Slow Computer?, Use this troubleshooting checklist