Constant but random lockups and freezing

Before November, my video card was broken and constantly overheated when playing games or watching videos(The screen would go black and the very last bit of sound would play over and over). After it was replaced I had a different problem. My PC often freezes when browsing the internet, computer or almost pretty much anything.

Except its pretty random, sometimes I can have a long time without freezing and sometimes it does it almost non stop. A weird thing happens sometimes when using a browser, where it doesn't look like it froze, it all acts as if its still working, it loads a page forever and I can still scroll around on the page I am already on, and if I create a new tab and then click on it, it only then freezes.

Then with games, it gets even weirder in that some games don't freeze or lockup at all(But very few, and the list seems to get smaller and smaller).
Some guys, such as gta4, fallout, Arma 2, operation flashpoint red river,etc as I play eventually seem to stop loading textures(extremely low res that was previously hd, or not showing any at all), models(No buildings where there should be), sounds and even scripts and after a while finally freezes, but in a sort of on and off pattern. It'll freeze for a minute, come back for a few seconds, and freeze again, and on and on. Sometimes it goes back to normal, sometimes I have to turn the game on again. Sometimes it just outright freezes without the texture and etc loss.

Some other games lockup similar to how my video card use to except with this time the last seen image stays but the whole computer is completely locked up and there is the last repeating sound and I have to hard boot it. Weirdly, this problem is newer only slowly starting to happen a few weeks ago with a few games, and now I can almost find no games that work.

Also rare but still happens, sometimes when the PC is turned on you can just see a black screen, and you can move around your cursor but thats about it, you have to restart.

These issues as far as I can remember(I am not sure about this) started to slowly come up when my old video card started to overheat and crash.

I've updated drivers of my video card and proccessor.
I've reinstalled windows a few times.
Tried doing a bunch of cleaning like registery errors,etc.
I've tried one of the tests that already comes with windows 7 for checking RAM errors, nothing.
I've done test for hard drive errors, nothing.
I've found no CPU testing applications, so if there is some it would be great if you could tell me.
I've tested for computer viruses.
I know I did a bunch of other things too but I can't really remember:/

I'm sorry for such a long and detailed post of my problems but uh.. yeah...

I used Speccy to get these, I'm not sure if thats how you are supposed to do it, so sorry if it isn't.

Operating System
Microsoft Windows 7 Home Premium 64-bit SP1
CPU
Intel Core 2 Quad Q8300 @ 2.50GHz 42 °C
Yorkfield 45nm Technology
RAM
6.00 GB Dual-Channel DDR2 @ 400MHz (6-6-6-18)
Motherboard
Packard Bell EG43M (CPU 1) 50 °C
Graphics
Viseo 230Ws (1920x1080@60Hz)
AMD Radeon HD 7700 Series
Hard Drives
932GB Western Digital WDC WD10EADS-22M2B0 ATA Device (SATA) 46 °C
Optical Drives
HL-DT-ST DVDRAM GH41N ATA Device
Audio
Realtek High Definition Audio



Thanks in advance.:)

What I would do...

Remove all traces of existing GPU driver, run off the generic MS vga driver. Down load and install the latest HD7700 series driver, it's about two months old. Then I would install ATI's afterBurner GPU program. It allows the user to make a custom GPU fan speed profile. Set it for 100% fan at 60*C. DO NOT OVERCLOCK!

You can't really trouble shoot the system until you have a clean driver install with temps under control.

Avoid using registry cleaners unless you know exactly what you are deleting, often you do more harm than good. Removing a few hundred lines from the registry makes no difference in performance.

Now you can start reading the mini dumps and you may find the problem, if you still have one.

madcratebuilder said:

What I would do...

Remove all traces of existing GPU driver, run off the generic MS vga driver. Down load and install the latest HD7700 series driver, it's about two months old. Then I would install ATI's afterBurner GPU program. It allows the user to make a custom GPU fan speed profile. Set it for 100% fan at 60*C. DO NOT OVERCLOCK!

You can't really trouble shoot the system until you have a clean driver install with temps under control.

Avoid using registry cleaners unless you know exactly what you are deleting, often you do more harm than good. Removing a few hundred lines from the registry makes no difference in performance.

Now you can start reading the mini dumps and you may find the problem, if you still have one.

I've no idea how to get completely get rid off a driver, nor how to run on the generic MS vga one(I'll assume its automatic though). I also don't know with what program to read mini dumps.

And yeah, with the registry cleaners I was getting kind of desperate.

And last thing is that its possible(Its 50/50 in my memory) I had this problem before the new gpu, so I'm not sure its the gpu's fault. But I'll try to do what you said first just in case anyway.

Thanks for replying.:)

Okay, so I uninstalled AMD Catalyst and all its drivers. Is that all I have to do?

Okay, here it is!:)

I've tested my drive already, but not by using a CD. No errors came up so do I still need to do it again but by booting with a CD?(It says the instructions are for if you cannot actually boot up your computer.)

If so, then the instructions get a bit confusing as I have a Western hard drive and its says there were problems when trying to test with Western's diag program by using a booting CD. So it suggests to use SeaGate SeaTools if you have a sata one which I do.

But then it gets a little hazy on what you are supposed to, though probably because I'm not so good with computers.
It just throws a bunch of links at me, and I'm not sure of which ones I need and what they are all for. Do I just need the ISO file he himself hosts?

I'm not able to do the hdd test yet as I'm busy with family stuff so I will have to do it tomorrow or so.

As for the power supply, I don't really have another one.
Is there some other thing I can do?