Wont get past "configuring updates stage 3 of 3 0%" and wont let me log into computer..HELP!!!

Question

heres a picture of the screen i keep getting.
-HP Pavilion dv6700 as you can see its home premium
i kept getting a vista spyware alert saying i had 34 infected files and wouldn't stop and i also tried updating some things on my laptop while i updated to the new internet explorer 9. around 12noon today i rebooted my laptop to get all the updates to work and i got this configuring updates screen and was like ok. it kept going. it does it for a while, shuts down and restarts and goes back i didnt think anything was wrong made it to stage 3 and wont stop and move on from 0%. its now 10pm and its been doing it all day. ive tried shutting it down and rebooting myself but no matter what i do, it wont let me access my computer to do anything. i have avast virus protection but it said it was unable to move viruses to chest i pressed repair and it said it was postponed until next reboot so i did it this morning and figured its taking so long maybe because its trying to repair them but im sure it doesnt take 10 hours...im extremely upset. someone please help. and also, anyone know how i can get the viruses out? i dont have money for a better protection right now so im using my moms computer but she works on it so its hard. hp said they cant help because my warrenty is up, was a 1 year warrenty, got laptop in 2008 and warrenty expired in 2009. please help me.

Answer 1

After installing updates from Windows Update, you may get into a Reboot loop where you machines gets to “configuring updates 3 of 3. x% complete” then freezes or reboots.
Solution: 
1a. Boot from the Windows System Repair Disc and choose the repair option in the lower left hand corner, choose System Restore, and select a Restore Point predating the attempted installation of the updates.
1b. If you don't have the DVD and the Vista/W7 came preinstalled on the machine, boot to the Recovery Environment using F8 at the HP logo during boot, choose "repair your computer" from the list, let RE load and do a system restore from there.
If restore fails, load the recovery environment command prompt and enter:
Del C:\Windows\winsxs\pending.xml
exit recovery environment and restart the pc, you may get 3 of 3 again but be patient, the desktop should load. Create a manual restore point and Turn off Windows  Automatic updates until you can figure out which update caused the loop.
If you get it booting again:
You may be infected
Follow the order given below to disinfect your PC
1.) On a PC that is Not infected, Make a boot AV disc then boot from the disc on the Infected PC and scan the hard drive, remove any infections it finds, I prefer the Kaspersky disc myself. The New 2010 Kaspersky disc can update the AV dat files if you are connected to the internet at the time of scan and is suggested to update before the scan.
http://www.techmixer.com/free-bootable-antivirus-rescue-cds-download-list/
2.) Then boot into Windows:
Install free MBAM, run the program and go to the Update tab and update it, then go to the Scanner Tab and do a quick scan, select and remove anything it finds.
http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html
3.) When MBAM is done install SAS free version, run a quick scan, remove what it automatically selects.
http://www.superantispyware.com/download.html
These last 2 are not AV softwares like regular Anti Virus Software, they are on demand scanners that only scan for nasties when you run the program and will not interfere with your installed AV, these can be run once a day or week to ensure you are not infected. Be sure you update them before each daily-weekly scan.