Bizzare freezing problem. Takes 30 minutes to load desktop, and just as long to load individual programs

Bizzare freezing problem. Takes 30 minutes to load desktop, and just as long to load individual programs

Hello there.
 
I'm at my wit's end.
I recently bought the Windows 7 Home Premium Upgrade, and installed it onto my XP PC.
But it's not run properly once since I did.
 
The problem I'm having is that it takes about 30 minutes to finish loading up the desktop.
Whilst this is going on, I can move the cursor about, but that's it.
Then if I try to run programs, those take anywhere from 5 minutes to an hour to run.
For example,
I thought my problems were being caused by the graphics card drivers being out of date.
I downloaded the latest ones whilst in safe mode (Which runs fine) and installed them after waiting for windows to load up properly.
The installation took 40 minutes.
It
also didn't solve any of my problems.
 
I've tried installing both the 32 bit and 64 bit versions onto my computer, and both have the same issues.
I've also tried installing it on two different hard drives, and again this makes no difference.
I'm pretty sure it's not the graphics card, because
the updated drivers should have solved the problem.
I'm at a total loss as to why this is happening.
The specs of my PC are
 
ATI Radeon HD 4850
AMD Athlon 64 X2 Dual Core 5600+ 2.81GHz
2GB of memory
I'm unsure about the motherboard.
It's an ASUS one.
It was new when I bought the processor.
I think I've ruled out the following;
Faulty copies of windows.
32 bit and 64 bit come on separate DVDs
Faulty hard drive: I've tried it with two
Incompatible graphics card: I installed the drivers, and although it's not super new, it's hardly massively out dated.
 
These problems make windows completely unusable, and I'm becoming quite frustrated.
I have a laptop, but I use my PC for work and play.

Anwsers to the Problem Bizzare freezing problem. Takes 30 minutes to load desktop, and just as long to load individual programs

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