SONY VAIO notebook freezes on xp splash screen every 2-4 mos.
first, ensure your system restore is turned on and make a restore point right now!...assuming you have run a thorough disk check and de-frag.
then, trust the system restore. I have used it with success 100% of the 20 or so times I have used it. Next, start using the "Hibernate" power down mode. I have found this to work wonders with third-party driver problems. It seems that once a good startup happens, then freeze it (and continue to get a good startup) with hibernate from then on. Last, check about every month for the quantity of restore points that have taken place automatically by Windows. Sometimes, depending on the size of the hard drive, too many points can begin to encroach on your free space that you want for virtual memory or data. So for example, I see 15 restore points in the last month, I will dlete them all by cancelling system restore. Then I use "clean disk" scandisk and defrag. Then I turn restore back on.
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