Problems with Windows Vista Ultimate

I'm facing problems with my Fujitsu laptop after I installed Win Vista
Ultimate (TM) RC1 Evaluation Copy, Build 5600.

1) I am unable to access files which I had used a program called OmniPass to
lock it. The user informations were all missing and there's no preset user. I
have tried to create new identities, but it can never run successfully to
create the identity.

2) Everytime I try to change my account picture and try to browse for
pictures, my laptop shows the BLUE screen that says "error" and restarts
itself. This happens when I try to change the desktop wallpaper and when I
try to shut my laptop down.

3) My printer can be detected but cannot be installed. Since it is an
ALL-IN-ONE (EPSON STYLUS CX 4700), it has a scanner, and this was detected
and can be used. Is there anyways to solve this problem? I have lost my
installation CD, and the drivers on my printer support sites cannot be used.

4) Whenever I turn on the computer, I get a message that says my High
Definiton Audio has stopped running. When allowed to get support
automatically, I always come to a page on MS website that says "A THREAD WAS
STUCK." It recommended a change of video cards. What should I do?

5) Is there a difference between Windows Media Format 11 Runtime and Windows
Media Player 11? Can I remove 1 of them?

5) There are 2 monitors -" Generic PnP Monitor on Mobile Intel(R)
915/GMS/910GML Express Chipset" & "(Default Monitor) on Mobile Intel(R)
915/GMS/910GML Express Chipset". The system has identified the monitor as the
former. Is this right? I have tried to change to the "(Default Monitor)" but
it does not work. It automatically reverts to the "Generic PnP Monitor".

*Please note that I did not do a clean installation but an upgrade of
Windows Vista. Also, my system does not meet requirements to install Ultimate
as it has ONLY a RAM of 502MB.

My system information:
- Processor: Intel(R) Pentium(R) M PRocessor 2.00GHz 2.00GHz
- Memory (RAM): 502 MB

>>> Is there anyway to revert to the good old Win xP? "To think I thought Win xP was BAD...!!!" <<<