1/2 hour after starting computer briefly freezes

[Don]

Each time I start my computer (from shut off / standby or hybernate),
approximately 1/2 hour later it freezes up for about 15 minutes. Screen
freezes, hour glass rotates, can't do anything with it...doesn't matter if
I'm online or off. After 15 minutes everything returns to exactly where I was
when it happened (I lose no information) & I can go on doing what I was
doing. Annoying & would like to solve it if anyone has experienced this too.

 

[Andrew E.]

Open event viewer,click on the warning/error that relates to the time pc
freezes,get specific details as to what its doing...

 

[Unknown]

Perhaps overheating? Check your fans?