<<...and ran the tuneup program to get rid of some registry errors>>
That is a step backwards, IMO.Bleeping Computer DOES NOT recommend the use of registry cleaners/optimizers
for several reasons:
Registry cleaners are extremely powerful applications that can damage the registry by using aggressive cleaning routines and cause your computer to become unbootable.
The Windows registry is a central repository (database) for storing configuration data, user settings and machine-dependent settings, and options for the operating system. It contains information and settings for all hardware, software, users, and preferences. Whenever a user makes changes to settings, file associations, system policies, or installed software, the changes are reflected and stored in this repository. The registry is a crucial component because it is where Windows "remembers" all this information, how it works together, how Windows boots the system and what files it uses when it does. The registry is also a vulnerable subsystem, in that relatively small changes done incorrectly can render the system inoperable. For a more detailed explanation, read Understanding The Registry.
Not all registry cleaners are created equal. There are a number of them available but they do not all work entirely the same way. Each vendor uses different criteria as to what constitutes a "bad entry". One cleaner may find entries on your system that will not cause problems when removed, another may not find the same entries, and still another may want to remove entries required for a program to work. Not all registry cleaners create a backup of the registry before making changes.
If the changes prevent the system from booting up, then there is no backup available to restore it in order to regain functionality. A backup of the registry is essential BEFORE making any changes to the registry.
Improperly removing registry entries can hamper malware disinfection and make the removal process more difficult if your computer becomes infected. For example, removing malware related registry entries before the infection is properly identified can contribute to system instability and even make the malware undetectable to removal tools.
The usefulness of cleaning the registry is highly overrated and can be dangerous. In most cases, using a cleaner to remove obsolete, invalid, and erroneous entries does not affect system performance but it can result in "unpredictable results".
Unless you have a particular problem that requires a registry edit to correct it, I would suggest you leave the registry alone
. Using registry cleaning tools unnecessarily or incorrectly could lead to disastrous effects on your operating system such as preventing it from ever starting again. For routine use, the benefits to your computer are negligible while the potential risks are great.
Why I dont use registry cleaners - http://www.edbott.com/weblog/?p=643
Should I Use A Registry Cleaner - http://aumha.net/viewtopic.php?t=28099
Your original error reflected a registry problem...if you actually formatted, such eliminates that from consideration as "the cause."
You say that you reformatted, installed XP anew...and subsequently developed problems. IMO, that means that you need to take a look at possible hardware problems.
<<Data error (cyclic redundancy check).">>http://www.tech-faq.com/data-error-cyclic-...ancy-check.html
That error usually indicates a problem with an optical drive...I don't see how this relates to installing SP3 at all...unless it's a possible indicator of hard drive problems.
You can find out the manufacturer of your hard drive by simply opening the case and taking a look at it. You could also go to Device Manager (Start/Run...type devmgmt.msc and hit Enter) and look at the detail reflected under Disk Drives...then use Google to see who the manufacturer is.
There is also a chance that all these situations are caused by a failing CMOS battery. It costs less than $5 to replace it. Tips for knowing when the CMOS battery is getting weak - by Iowaprodigal - Helium - http://www.helium.com/items/806743-tips-fo...is-getting-weak
CMOS Battery Replacement - http://www.liverepair.com/encyclopedia/art...cmosreplace.asp
Edited by hamluis, 10 October 2010 - 05:07 AM.