Windows 7 very slow booting. taking 10-15 minutes to boot after critical update?

#1
I had just done a critical update a few nights ago, and after rebooting my pc to finish installing, my reboot now takes 10-15 minutes. When the pc comes on and says ACER is where it sits the longest, and i dont think i can enter bios or change boot devices either, ive pressed and pressed the keys. I tried to system restore to a week or so back, no avail, also did a clean install of windows 7 ultimate, and still doing the same thing. Any ideas?

Its a ACER E380
BIOS: Phoenix - Award WorkstationBIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4400+ (2 CPUs), ~2.3GHz
4 GB of ram
320 GB Hard Drive
Radeon HD 3650 Video Card
Norton Internet Security Suite
Windows 7 Ultimate
I dont have alot of software at the time installed, just mozilla firefox, thunderbird and a media player.


Once the computer is booted and at desktop there is no problems whatsoever tho.
 


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