Vista white screen on startup

[muller12]

Vista white screen on startup
Ok - I installed SP1 just over a month ago and everything went well, no probs for a few days. Then I noticed that on startup at the point the welcome screen would usually fade into your desktop it faded into a plain white screen that would stay there for around a minute and a half, before then going to the desktop. So the machine is not crashing and you can access task manager but you still have to wait for the white screen to go before you can do anything else. Anyone got any ideas? My machine specs are below, and please - no 'vista is sh*te' etc comments (although requesting something like that is like a red rag to a bull!)

Mobo: ASUS P5E x48
CPU: Q6600 (not overclocked)
RAM: 2Gb Corsair XMS2 800MHz
GFX: BFG 8800GT OC2, running the latest drivers (released on 13th may)
OS: Vista 32bit
HDDs: 75Gb ED Raptor with Vista and a few games, 250Gb Seagate with everything else
PSU: Hyper TypeR Modular 580W

Cheers in advance for any advice!
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