boot loading problem

Anyone help please... I've noticed in the past that sometimes my laptop get stuck when I reboot It. I mean, it won't continue loading the system files and all the other programs. I just get stuck on a black page just after the windows glowing image fades. Or sometime I could reach the desktop then it gets stuck all of a sudden. I thought It's okay now because I just recently did a complete restore. But I was wrong. This problem still exist. What could be causing this problem? How can this be fixed? Please help.

Check your ram.
Memory Diagnostics Tool
Memtest86+ - Advanced Memory Diagnostic Tool

Check your HD.
1) Boot DVD, & Press Shift+F10 (for command prompt)
2) Boot DVD, & Command Prompt at Startup (for command prompt)
Open an command prompt.
In the command prompt, type chkdsk C: /f/x/r/v and press Enter.

Disk Check
SFC /SCANNOW Command - System File Checker
Check Disk (chkdsk) - Read Event Viewer Log

Check the hard drive with the manufacturer's diagnostic tools.
Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.
HD Diagnostic

Ok. I'll try these guys... I'll post a feed back as soon as I can...

@ ezio: hey man, how would I know which programs are conflicting If I clean boot windows?

So I have to do it one by one... But it's not always that rebooting gets stuck. most of the time it just goes fine. But it's a total drag when I'm in a hurry to get some files and then this stuck thing happens. Or when I'm watching a movie and browsing the internet at the same time then it gets stuck all of a sudden.

@ ezio: hey man, It's not conflicting anymore... I'll try running those diagnostic tests that theog posted..

g.cards? im using a laptop man... if I open the case I might void the warranty...