Seeing as you have done a clean install of Sys 8.6 one of Apple's
suggestions to avoid screen freezes is to trash the file Desktop Printer
Spooler.

Also I reinstall Internet Explorer and Outlook Express in such stressful
times. This can usually be done with Microsoft Self Repair, which is
probably in your machine somewhere.

Outlook Express has a folder called Identities which you should duplicate
entirely and put somewhere safe to preserve your email and other stuff. I
backup that file every week.

Also save your "Favourites" in Internet Explorer before running Microsoft
Self Repair. Saving favourites can be done after opening up "Organise
favourites".

A reinstall of all plugins like Shockwave and Real Player with the latest
versions can save further hassles.

Quicktime is available in a more recent version than came on the original
Apple clean install disk, as is Acrobat reader.

An quick and easy way to get the latest versions of all these apps is to go
to a newsagent and buy a magazine such as MacFormat with the appropriate
stuff on a CD.

Remember, save Identities and your favourite bookmarks befor doing anything.

Regards, Paul.