*Driver_irql_not_less_or_equal
*0xD1 error with other sectors listed (i.e. 0xeed77cf1)
*PXE-E61 failed on network LAN boot
WinXP, SP2 (had SP3, but downgraded due to vulnerability problems).
AMD, Compaq Presario M2105US

System Restore (need to be in "normal mode") & Last Known Configuration don’t help.

Chkdsk fails on reboot and scandisk does not run in safe mode

BIOS settings have been reset to default

I had Symantec Anti-virus w/Live Update, but that has not been performing well lately and I deleted it as Live Update was not actually Live Updating it. Any anti-virus software I dl, it refuses for some odd reason. What I do have installed is Malware Bytes & Wise Registry Cleaner 4.

I have seen most tech forums on the Web and none of them have been providing me a right answer, so I will take suggestions from here. Thanks to those that help me, I truly appreciate it. 🙂

My system registry was cleaned using CCleaner.(This program is a freeware and downloaded from http://www.ccleaner.com/)

In this process I lost all updates(something around 100 updates..) of windowsXP SP2,which is a pirated version.The updates are periodically down loaded from windows website

And I couldnot undo the action.

But my system is working normal even after loosing the updates listed in control panel>add remove program window.

My doubt is why CCleaner programs recommonded to remove the updates when they are part of widows XP operating program.

And what could be the consequenses I have to face because of the loss of updates in the future.

I work from my home and i’m on my computer all day,every day.So I clean the registry every night,is that harmful to my OS,using XP pro sp2