Windows XP SP2 Standby freeze

This started happening a couple weeks ago, and I don't know what could be the
problem , suddenly one day ( It was set to stand by every hour) When I come
back, and resume from stand by, I see that it takes a while longer to get
the monitor on, and, finally when the screen appears, everything is frozen!
so I had to do a hard shutdown (at first I waited about 10 minutes) and I
restarted and tried it again, and the same thing happened. It has been
happening since then and I don’t know what could be wrong. I know it's not
spyware or a virus, since I have nod32 updated to the most recent virus
signature, and zone alarm security suite (recently updated to the new version
, I don’t know if it has nothing to do with it). The program that I think
might of messed up is perfectdisk, I had recently downloaded a free trial
because I was seeing a performance break and I saw that my hard disk was
really fragmented, especially the system files which windows defrag doesn't
work on. so I did the "smartplacement" with all files including system files
(offline defrag) and the computer just got slower, and I wasn’t happy to see
that my MFT zone had been messed up, leaving no space reserved, and the Sims
2 continuous with the MFT, as well as a slideshow I had opened that day
(found this out later using o&o) I think it has to with that, but I’m not
sure, although they did happen at very close times (offline defrag and
standby freeze problem). looking in the system event viewer, all i could see
at that time ,was: the following boot time drivers have failed to load:
MPFIREWL and PARTIZAN, which after doing research was left even more clueless
than before. I hope someone can help me , I would be very thankful!


Gabriel

PS. sorry if it was too long and boring, I have spent hours on trying to fix
this, and I am a little sleepless! :O

Again thank you for your help!