Issue with my windows7/ acer desktop keeps crashing

hi guys,

i have had my pc for just under 1 year everything on it was fine untill about 3 mounths ago when suddenly all sound starts to break up and the computer slows down untill eventually crashes, this seems to happend after 30 to 45 mins of use. I have run 3 types of AV software and it never finds anything. Although it seems to run fine in Safe mode. any ideas?
Cheers
 
How to find and post your Minidump Files:

My Computer > C Drive > Windows Folder > Minidump Folder > Minidump Files.

It is these files that we need (not the folder). Attach to your next post the five most recent dumps. Notice the Manage Attachments button at the bottom when you go to post the next time. You can Zip up to five files per Zip; if you only have one or two you don’t need to zip them, just attach as is. Please do us a favor and don’t Zip each one individually.
 
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