Major Vista problem(s) (Slow loading)?

Question

Custom computer build:
-Mobo = Asus P5GC-MX/1333
-RAM(OCZ brand) = 2GB DDR2 800 (PC6400)
-HDD 1 (Primary) = 320GB SATA 7200RPM
-HDD 2 (Secondary = 80GB SATA 7200RPM
-CPU = Intel Core 2 Duo @ 2.66Ghz ~OC'd 2.76Ghz
-PSU = 550 Watt
-Graphics Card = XFX GeForce 9800GT 512MB DDR3
-OS = Windows Vista Home Premium OEM (SP1 & SP2 & ALL updates) [Installed on HDD 1 Partition 0]

Note: The mobo supports DDR2 533 & DDR2 667 RAM, i took out the 2GB of DDR2 800 and placed 2GB of DDR2 533 RAM and it was as slow if not a little bit slower because of the lower frequency RAM. I also fine tuned Vista to run a lot faster a few months ago and it did! But after i got those 2 BSODs my computer has had very slow loading. And as you can see from my computer build i do not have a very poor or outdated build, in fact my build should not be going this slow because of the good hardware.

Here is the problem(s). About 2 months ago i used a partition program (Partition Magic) to partition HDD1 and when windows restarted to finish the partition it gave me the BSOD. So it restarted again after and then i went to ADVANCED OPTIONS and went back to the last known good configuration. Windows started up just fine after that, and so i decided to give it another go, so i tried to partition the drive with the same program and it did the same thing. I went back to the last known good config. yet again and restarted Windows. Ever since then my computer has been loading very slowly!

It takes my computer about 1 minute to startup, then when i get to the logon screen if i do not start typing my password and i leave the computer to idle it will restart. But after i type my password and press ENTER it will login, but when its logging in it takes about another minute to get past the login screen and shows the desktop. When it gets past the logging in screen loads the desktop and 'explorer.exe' very slowly. Im kind of stumped on this issue, i am very good with computers (i have fixed and troubleshooted every problem that i have came across, even fixed friends' computers.) I have cleaned my HDDs too. Here is everything i have done to try to fix this issue.

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-Deleted unused & old files
-Organized my personal folders
-Used Tuneup Utilities 2008 to do the following:
System Optimizer (for best performance)
Delete unnecessary files & backups
-Used CCleaner to clean the following:
[Windows Explorer] = Recent Docs, Run (in start menu), Other Explorer MRUs, Thumbnail Cache
[System] = Temp Files, Clipboard, Mem. Dumps, Chkdsk File Fragments, Win. Log Files, Win. Error Reporting, Start Menu Shortcuts, Desktop Shortcuts
[Advanced] = Menu Order Cache, Tray Notifications Cache, Window Size/Location Cache, User Assist History, Custom Files & Folders
-Emptied Recycle Bin
-Virus/Adware Scan (found nothing)
-Used Registry Mechanic to do a Registry Scan & Repair
-Used O&O Defrag to defrag my HDD(s)
-Check Disk to find bad sectors & attempt to fix them

I also used the Vista Home Premium OEM disc to try to repair any problems it found but it didn't find any issues wrong with the OS.
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Answer 1

Reinstall Vista. It will solve a lot of problems most of the time.

Answer 2

Most computers actually run slow because of a hidden part of your system, which is constantly being used by Windows. This part of your PC is called the "registry" and is the central database for Windows, which stores everything from your latest emails to your desktop wallpaper. It's one of the most important parts of Windows and can easily make your PC run slow.The more corrupt registry files your computer has, the more it struggles to read them.The files which makes it run slower and slower. To fix this, you simply need to use a registry cleaner http://cleanup-comuter-run-perfectly.com . These are small software tools which actually work by scanning through the registry and fixing any bad files that are in there. This then allows Windows to read as many files as it wants, when it wants to.

Answer 3

Sounds like you have too much stuff for Vista to handle on the startup. Try defragging your registry and disabling some of your startup programs if you don't need them.

I use Iobit advanced system care (free version) to do both of these things for me. Once it knows what you want to run at startup, it stops all the others from running.

You could always run spybot and see if you have a problem with spyware.