Whats the best way to re-install ubuntu 10.10

Are you informed of this when you try to upgrade from Lucid to Maverick!? Details please......

The upgrade was done around Oct 14 - i am no sure of exact date. the main problem I am having is that getting no sound which I had when first updated to Maverick. I all fell apart after I use the Computer Janitor program.
My sound card is on the Mother Board which is ECS P4M900T - M2.
 Cat /proc/asound/card*/codc#*

fred@fred-desktop:~$ cat /proc/asound/card*/codec#*
Codec: VIA VT1708
Address: 0
Function Id: 0x1
Vendor Id: 0x11061708
Subsystem Id: 0x10191349
Revision Id: 0x100700
No Modem Function Group found
Default PCM:
    rates [0x0]:
    bits [0x0]:
    formats [0x0]:
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
Invalid AFG subtree
fred@fred-desktop:~$

I have windows XP sp3 On the same computer.

Did you tried to create new user account? It have sound, or still not?

I can not create new user account the gnu program hangs. The last time I was on Marerick I could not shut down - it kept asking me to sign in. It is also, I think, causing errors when boot into windows XP, so I am going delete Ubuntu and try later to install

I can not create new user account the gnu program hangs. The last time I was on Marerick I could not shut down - it kept asking me to sign in. It is also, I think, causing errors when boot into windows XP, so I am going delete Ubuntu and try later to install