SHould i reformat?

[halokid]

Ive been working on a in -laws computer and was wondering if i should reformat
heres the deal:

Th computer wouldnt load the gui it would simply  black screen with cursor...
Id also get a Bsod and a win xp checking for bad sectors screen........

this repeated after a supposed (not by me) system recovery repair(non reformat)
i did the same thing and quickly removed all norton anti virus stuff, replaced it with avg
avg  found two spywares.
(updated) updated bios, chipset, graphics card drivers, and uninstalled a few needless programs... also intel had by default in bios,  set the single sata hard drive to raid configuration... i found a way to go from raid mode to ahci mode without having to reformat/reinstall windows...im using a hard drive- driver that i hope will continue working.. the thing  is everything checks out and runs well... so my questions are....

other tests i did
raid promise removal tool (official hp )
memtest86
smart full scan
check disk

1. Should i trust that this recovery is stable? and will continue working...
2. Might the recovery wrote on a good sector this one time and the bad sector might be waiting to hand out bsods?
3. is it still plausible for it to be a power supply?
4. do recovery disks reformat for you and can i install a fresh copy with ahci mode?

specs: Core duo e6300  2 gb ram Hp Pavilion a1640n

any help or comments would be greatly appreciated.

[Mark H]

Any updates? How is the PC doing now? Are you still experiencing problems?

Mark H

[halokid]

Thx for asking Mark,

update: All seems to be well, it is said to be working great.

I never knew precisely what was causing the bsod, but
i threw everything i had at it. I've heard about quite a few of xp service pack 3 issues and i cant help but wonder if that is where the problem occurred. I disabled automatic updates through the services.msc so  sp3 wont be returning anytime soon. He's a good enough pc user to get the critical updates anyways.