Win 7 64 bit freeze when using flash based online videos

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Hello everyone,

I got a new Acer Aspire 7745G just a week ago, with a pre-installed Win 7 Home Premium 64 Bit system.
I can go on and on about what I installed on it so far, but I doubt it'll do much difference since I think I narrowed down the problem.
Basically whenever I try to watch online videos that are based on flash (for some reason it didnt happen to me with flash based online games) the computer freezes, screen goes black and there is an irritating sound from the speakers (depending on the last sound that was playing on the movie).
For now the problem seems to appear only on Firefox and Chrome, as the Internet Explorer seems to have worked around it and do fine... But I prefer using Firefox and this issue is very annoying.
I tried to look everywhere and noticed other people having similar issues but found no cure.
At one of those freezes, instead of freezing I got a popup message saying the ATI driver has been restarted which led me to believe it's either the graphic card or the driver.
Heavier games such as Fallout 3 work without an issue for a few hours on the computer, so I can only assume my Radeon Mobility HD 5850 is fine. I tried uninstalling and reinstalling the drivers from Acer support site but the problem persists.
Obviously I also tried uninstalling the Flash player, and it didnt solve anything.

My computer has a function of switching the cards, from the HD 5850 to the Intel onboard one... Tried that, problem solved !
Only I dont feel like keep switching back and forth, plus for some reason the computer sometimes changes back to the HD 5850 automatically after a period of time.

Still a bit scared it's my gfx card that has an issue (heard about those HD 5850 coming with defects), and if it is I should figure it out and go back to the shop to get the thing replaced while I'm still within my 14 days period of warranty. Then again, games and practically every other aspect of the computer is working fine... So I doubt it's that.

My current guess would be the ATI drivers, seeing as it all works fine on the intel based ones- But I dont know where to find different ones...

Ideas anyone ?
 

My Computer My Computer

At a glance

Windows 7 Home Premium 64 BitI5 430M 2.26GHz4GB DDR 3ATI Mobility Radeon 5850 1GB DDR3
Computer Manufacturer/Model Number
Acer Aspire 7745G
OS
Windows 7 Home Premium 64 Bit
CPU
I5 430M 2.26GHz
Memory
4GB DDR 3
Graphics Card(s)
ATI Mobility Radeon 5850 1GB DDR3
Monitor(s) Displays
17.3"
Hard Drives
640GB 5400 RPM

My Computer My Computer

At a glance

Win7 x64 + x86Intel i7 920, other Intel chips, and the Atom...12 gB; 4 gB Lenovo; 1 gB Samsung netbookATI 4870
Computer Manufacturer/Model Number
Home built (x64), Lenovo x61s Tablet, Samsung Netbook
OS
Win7 x64 + x86
CPU
Intel i7 920, other Intel chips, and the Atom in the netbook
Motherboard
Asus P6T Deluxe
Memory
12 gB; 4 gB Lenovo; 1 gB Samsung netbook
Graphics Card(s)
ATI 4870
Sound Card
Yes, I have one of these
Monitor(s) Displays
32" Sharp Aquos TV
Screen Resolution
800x600 - I have vision issues
Hard Drives
4 - 150 gB Velociraptors in RAID 5
Promise controller
PSU
1000 watt (can't recall the brand)
Case
Antec 300
Cooling
Big honking cooler that was rated highly at Toms Hardware
Keyboard
Microsoft Natural
Mouse
Logitech Trackman
Internet Speed
Cable
Other Info
GeekSquad UPS
CyberPower UPS
DLink DNS-323 NAS (2 tB)
Netgear wireless router as an access point
Netgear wired router FSV-318
Home network consists of
4 desktop computers (2 Vista, 2 Win7)
1 netbook (Win7)
4 laptop computers (XP, 2-Vista, Win7)
Wii and XBox 360
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