Windows 7 crashes

[virdip]

Hey,

I upgraded my 64-bit vista system to windows 7 home premium. I bought the software from windows rather than the manufacturer.
the concern:
normally if i let my computer sit idle for some time, it goes to stand by mode within 2 or 3 minutes. however of late, i am seeing that rather than going on stand by, the computer just freezes: the screen is off, the light is running and no matter what I press on keyboard, it stays in that mode. Basically I have to manually shut it off and restart the computer then. Has anyone seen this occur with their computer and if yes what did you do to solve this issue?
just as a footnote i must mention, that i had reformatted my computer to its factory conditions and upgraded immediately to windows 7. That is I did not get the most recent hardware upgrades from the manufacturer for vista, althought I did get all the windows upgrade. Do you think my keen ness to get 7, has gotten me into this problem?
Thanks,

your help will really be appreciated.

oh yeah i forgot to mention that I did not do clean upgrade and also when such instances happen my anti-virus tells me that it was trying to get an upgrade but it failed..

 

[whest]

Put up your system specs - try updating your video card/device to the latest driver.

 

[virdip]

I have done that with no success

 

[usasma]

Upload Dump Files:
Please go to C:\Windows\Minidump and zip up the contents of the folder. Then upload/attach the .zip file with your next post.
Left click on the first minidump file.
Hold down the "Shift" key and left click on the last minidump file.
Right click on the blue highlighted area and select "Send to"
Select "Compressed (zipped) folder" and note where the folder is saved.
Upload that .zip file with your next post.

If you have issues with "Access Denied" errors, try copying the files to your desktop and zipping them up from there. If it still won't let you zip them up, post back for further advice.

If you don't have anything in that folder, please check in C:\Windows for a file named MEMORY.DMP. If you find it, zip it up and upload it to a free file hosting service (not RapidShare as the analysts usually can't download from it) - then post the link to it.
Then, follow the directions here to set your system for Minidumps (much smaller than the MEMORY.DMP file): Set MiniDump