Slow computer IE freezes
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Slowly tap the F8 key while the computer is powering up
Just after Verifying DMI files occurs the F8 key will point the computer to a menu where safe mode can be selected.
Note if you mistakenly tap F8 key again, it will continue through to normal boot
Scroll and select safe mode with network
Use explorer to delete the contents of the folder datastore.
Datastore can be found in c:\windows\softwaredistribution.
You may have to do this regularly when the computer slows.
The folder rebuilds itself and the contents are to do with windows updates and logs for errors. There is no harm in deleting the contents.
Reboot.
Also
In IE6 >tools > internet options > advance tab >Click Restore defaults
Tick empty temp files when browser closes (this empties the cache)
Delete Browser History, cookies the whole lot regularly.
Close the browser to set the settings.