Firefox hangs, shows Not Responding, on start up and at random times

Firefox is hanging on start up and at random times during use. When I click the desktop icon it takes about 20-30 seconds and then opens the usual Firefox start page. However as soon as I move the mouse or try and use anything on the screen it hangs. The Firefox logo top left in the blue bar turns into a white box. After about 2 minutes it reverts to the Firefox logo and all starts working normally.
However every now and then the same thing happens, white box, and the Not Responding words in the top blue bar. Sometimes the whole webpage goes blank white, with only the very top blue bar and side scroll bars showing.
It reverts to normal after a minute or so.
This has happened with the last few versions so it is not due to the last update.
I've tried most things (plugins, stop hardware acceleration, etc) except the one below - maybe someone has an answer to why I can't do the one below?
I've read that you can try and correct by right clicking the decktop icon, choosing Properties, and then Select Compatibility and my Windows Program which is Windows XP SP3. However when I try this the latest Windows showing is 2000. - Maybe this is my problem - how do I get the comnpatibility to Windows XP S3?
Thanks
Gaz

Hey ramjet.
Could you please copy/paste your info from your post to [https://support.mozilla.org/en-US/questions/new questions/new]? That'll help us get specific details about your Firefox configuration so we can assist you one-on-one.
Thanks!

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