How can I delete these files?

For Internet Explorer 5 and above, you can follow these directions to clear out temporary files and delete cookies.

1) Open Internet Explorer and click on Tools
2) Click on Internet Options
3) On the General Tab, in the middle of the screen, click on Delete Files
4) You may also want to check the box "Delete all offline content"
5) Click on OK and wait for the hourglass icon to stop after it deletes the temporary internet files
6) You can now click on Delete Cookies and click OK to delete cookies that websites have placed on your hard drive.

To clear the Internet History in IE:

1) Open Internet Explorer and click on Tools
2) Click on Internet Options
3) On the General Tab, in the middle of the screen, click on Clear History
4) Click OK

To clean up other temporary files on your computer in Windows 98 or higher:

1) Click Start,  Programs (or All Programs), Accessories,  System Tools, Disk Cleanup
2) Choose the correct drive usually C:\
3) Check the boxes in the list and delete the files