I'm sorta guessing that it could be a simple matter of not enough memory. For Firefox, it depends upon the website. You can have some sites that will max out your CPU and RAM, usually due to bad programming. And with having Outlook and 4 tabs (4 websites) open at the same time, you're greatly increasing the chances that everything is just flat running out of resources. If it were 4 sites like Google.com, it'd not matter, but it's amazing how much RAM some websites will eat up, regardless of the browser.
Another possibility could be too many temp files on your system, such as temporary internet files - particularly if your hard drive is less than 80GB or if you have a lot of other files and/or programs on your computer.
Next guess would be a problem with your hard drive. If the drive gets messed up, the whole system can freeze up sometimes, with nothing you can do to unfreeze except hard reboot the way you did.
Besides RAM/Hard drives scans with Ultimate Boot CD there are a couple other things you can try as well.
Here are a couple of cleanup programs that might very well help without buying anything:
[ul][li]CCleaner[/li]
[li]Glary Utilities[/li]
[li]Advanced System Care[/li]
[li](If you're running Windows XP, which it sounds like you are)RegScrubXP would be good.[/li][/ul]
The first 3 programs you can download from
The forth program is harder to find. You can find it at
Matter of fact, here's a direct link (direct to the file page, not the actual download. You'll need to click a link to download):
And other than all of that, it could simply be you've got some sort of malware lurking on your system eating up CPU cycles and RAM on its/their own. For that:
If you've got a typical Norton/McAfee antivirus, try uninstalling that, and install Avira Antivir instead.
For your firewall, install Online Armor.
Otherwise, also install Malwarebytes Antimalware. As soon as you get Malwarebytes installed, run a quick scan, and remove anything it finds... then reboot - whether asked or not... then do another scan if it found anything the first time.
Also, these would be good to put on your system:
1. Windows Defender
2. SuperAntiSpyware
3. SpywareBlaster
Somewhere in all that time, I'd suggest scanning with Avira Antivir as well.
Anyhow, the RAM upgrade would still be recommended - software is using up more resources, generally speaking, as they add new features, get prettier, etc.
I'd suggest at least 2GB as a minimum for Windows XP if at all possible.
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"If to err is human, then I must be some kind of human!" -Me