Help My pc is loading very slow

[floni]

Today I started my pc and it was very slow. Normaly it takes less than 5 minutes to start up and run all startup programs, today it took over 30 minutes.
I have a good pc and I really don't know what the problem is. I got good cooling and my pc is cool inside. I checked all the cables in my pc and they are all connected. I updated my videocard drivers to the latest version. I use avast as anti-virus so I don't think that I got any viruses. This also happened 2 months ago, I tought my gpu was broken so i bought it to a pc-engineer and he tested my gpu and it worked perfectly. While my gpu was gone I didn't use my pc for a week and when I got my gpu back, it all worked fine again. Please help me.
SPECS:
Windows 7 Ultimate Edition (Build 7600)
CPU : Intel Core2 Quad CPU Q8300 @ 2.50GHz
GPU : AMD Radeon HD 6900 Series
DirectX Version : 11.0
RAM : 4096 MB DDR2 Dual Channel

[_Smile_Man_]

SPECS:
Windows 7 Ultimate Edition (Build 7600)
CPU : Intel Core2 Quad CPU Q8300 @ 2.50GHz
GPU : AMD Radeon HD 6900 Series
DirectX Version : 11.0
RAM : 4096 MB DDR2 Dual Channel

Nice videocard,
but not a nice CPU.
RAM is good enough,...
It's not a problem with your pc specs.
Maybe you shout scan your pc, maybe it's a virus.

---

It can also be that have a slow harddisc...

[aosma8]

Maybe you should try CCleaner, it will find all the useless files and delete them.

http://www.piriform.com/ccleaner

[OrangePL]

Clean registry and get paid antivirus

[floni]

Problem solved