
I've been having since around 3 weeks a serious problem with Firefox and i'm looking for solutions

Here's my story about it:
Till October i was using Avant Browser and i had back then 512MB RAM (Pentium 4, 2.4GHz, Win XP Pro SP2, PC bought in 2003). Everything was fine with Avant but after some time it started to become very hungry and it took a lot of memory (most of the time it was between 60 and 100% of CPU usage and above 40MB of memory usage). So i decided to switch to Firefox and it was also good at the beginning. Avant was deleted and in November i added 1GB RAM and i have since then 1.5GB of memory. I hoped that it would solve the problem but i was wrong cuz in January Firefox became even hungrier than Avant (50-100% of CPU usage and 100-120MB of memory usage). On the forum of the french computer magazine Micro Hebdo i was given the link (on their download software website) to a free software that reduces the memory usage of Firefox. It did indeed decrease from 100MB to 1-15MB but the CPU usage is still high! (50-90%) to make things worse, Winamp also started using a lot of memory (40-65% CPU usage and 30-70MB memory usage) and it doesn't even matter if there is one mp3 or 500 mp3s in the playlist. Also, for some reason it happens (rarily) that Skype takes a lot even when i'm not using it. Before it used to take memory when i was in a video-conference. Half a year ago i didn't have any problem with Winamp.
I guess that the problem with the memory isn't that big. Firefox also opens website in a really really really weird way! And that worries me even more cuz i deleted both the program and its folder in Program Files then cleaned the PC with CCleaner to get rid of all the trash, then reinstalled Firefox and the problem is still here. I thought that the program got corrupted or something. First it happened when many tabs were open (at least 6-8) but now it happens when i open only one tab

Example 1 - TV Program first time
http://i132.photobucket.com/albums/q30/ ... tled-4.jpg
Example 2 - TV Program after refresh
http://i132.photobucket.com/albums/q30/ ... tled-6.jpg
Example 3 - The way the TV Program should look like (opened with IE)
http://i132.photobucket.com/albums/q30/ ... led-12.jpg
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Example 4 - Some article aboud 3D DVD (red icon TRWA on the right is from the TV Program page)
http://i132.photobucket.com/albums/q30/ ... tled-5.jpg
Example 5 - How this article should look like (opened with IE)
http://i132.photobucket.com/albums/q30/ ... led-13.jpg
[align=center]------------------
------------------[/align]
Example 6 - Another page looking very wrong (those images don't even belong to that page)
http://i132.photobucket.com/albums/q30/ ... tled-2.jpg
[align=center]------------------
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Example 7 - One more wrong look of a page
http://i132.photobucket.com/albums/q30/ ... tled-3.jpg
Example 8 - The same page should look like this
http://i132.photobucket.com/albums/q30/ ... led-14.jpg
[align=center]------------------
------------------[/align]
Example 9 - The home page
http://i132.photobucket.com/albums/q30/ ... tled-8.jpg
Example 10 - The home page after refreshing it
http://i132.photobucket.com/albums/q30/ ... tled-7.jpg
Example 11 - How the home page should look like
http://i132.photobucket.com/albums/q30/ ... led-15.jpg
[align=center]------------------
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Example 12 - Finally instead of opening the page, Firefox shows me this

http://i132.photobucket.com/albums/q30/ ... led-11.jpg
The websites that were opening really bad were Facebook, WP.pl, Trancehits.com and now Photobucket.com also opens in a similar way.
Those websites open very well with Avant and IE.
A few important things to mention:
The newest versions of Firefox, Winamp (and Skype to a much lesser degree) are used and downloaded from their official websites. Also, the same programs are used on the laptop (Toshiba Satellite M70-122, year 2005, Intel Pentium M 1.73GHz, 1.5GB RAM - also added 1GB in November, Win XP Home SP3) and there have never been any problems of this kind with the memory, Firefox (and Avant before) and Winamp.
One last thing, last year the average temperature of the Processor Zone was 43 degrees. Today it is 78 (from 73 it is the red temperature zone). The System Zone 1 and 2 are also on the thin line between yellow and red temperature zone. I had to shut down the PC more than 1 hour ago to let it cool down. And i started writing this topic before 6pm (!) but while i was making print screens, using photoshop, 3 IE and the Firefox, the PC started working so fuckin slowly that i got a huge headache when i shut it down at 7h15pm

All this leads me to this one question: WHAT. THE. HELL. IS GOING ON?!

THX!
I'll be using the laptop from now on until the problem with the PC is solved.