Re: Installing RAM
The PXE error indicates that it is unable to boot from the network, which should be the last item in the boot order.
Put the Windows CD in the drive and reboot, if the message to "Press any key to boot from CD..." appears, press enter.
If this works, let the machine finish booting from the CD, then select "R" for the repair option.
Log onto the C drive, and run chkdsk /p to repair any errors on the hard drive.
When chkdsk finishes running, type exit to reboot the machine and remove the CD.
Then try to boot without the CD to see if it fixed your problem.
If you get the same error with the CD in the drive, then the boot order may be messed up. If you can't access the BIOS the only way to fix this would be to reset your BIOS (remove the CMOS battery from your motherboard, wait 15 mins, then put it back in and try to boot).
This is, of course, assuming it is the problem.
Laptop: Dell XPS 17 | i5-2450M @ 2.5GHz | 6144MB RAM | GeForce GT 550M
Desktop: HAF 932 Advanced | i5-3750k @ 4.4GHz | CORSAIR H100 | ASUS P8Z77-V | EVGA GTX 680 2GB | 8GB G.SKILL DDR3 @ 1600 | MUSHKIN 240GB SSD | WD 500GB 7200RPM HDD