By windows "repair" do you mean a reinstall (over the top)?
In doing the "Clean Boot" did you "hide" the Microsoft services and then disable the rest -- I'm not sure what you mean by "unnnecessary" startups.
First, restart in Safe Mode if necessary -- (tap the f8 key promptly on startup and choose the Safe Mode option from the boot menu) or Normal mode
Then:
Run
msconfig and select the "Services" tab.
Check "Hide Microsoft Services" and then disable the rest. Also uncheck "load startup items" on the general page.
Now restart and test the issue at hand
If no problems, run
msconfig and recheck half the disabled items on the Services tab. Test again. If the problem recurs, UNcheck half the items you just checked to narrow down the culprit.
If the problem didn't occur, check the other half, so all the Services are enabled -- proceed to do this on the startup tab as well.
Get the idea? You want to isolate the problem to a specific startup if possible.
Note: if you already have items unchecked under msconfig > startups and are in “selective” startup mode – you should note what these are before beginning. They will need to be de-selected again.
http://support.microsoft.com/kb/331796/en-us
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Also get me the minidumps for any BSODs
I can run a debugging utility on the dump files if you do this:
1 > create a new folder on the desktop and call it "dumpcheck" or whatever you like
2 > navigate to
c:\windows\minidump and copy the last few minidump files to that folder. *this assumes 'c' is your boot drive, if it is not, subsitute accordingly
3 >
close the folder and right click on it and select
Send to Compressed (zipped) Folder.
4 > use the "manage attachments" in the "advanced" reply window to upload that zip file here as an attachment.
This might point us to a non Microsoft driver causing the error, if one exists for it.
If you do not see any minidumps, be sure you are not using any cache cleaner such as CCleaner. Also run
sysdm.cpl and select Advanced > Startup and Recovery. Make sure "small memory dump" is the one chosen under "write debugging information" and the location should be
%systemroot%\minidump