Will reinstalling patches on top of another cause any issue?

Having discovered Qchain, I was wondering if I can re-install a hotfix on top on a version already installed. The reason I ask is some of the pc's have been patched with various patches (all xp machines, don't ask me why but this was the set up when I get here)
I have created a folder containing the hotfixes, a copy of qchain and a batch file.
If I was to run the batch file and the hotfix included in the batch file was already installed would that cause any complications.
Thanks

exdosAsked:
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war1Commented:
Greetings, exdos!
>> If I was to run the batch file and the hotfix included in the batch file was
>> already installed would that cause any complications

I have reinstall hotfixes and have had no problem.

Best wishes, war1
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NeilDavisCommented:
Reinstalling hotfixes is not a problem.  It is indeed necessary in some instances....

"Hotfixes are applied only to software that is already installed when you apply the hotfixes. For example, if you remove a component and later reinstall it, you must reinstall any hotfixes that apply for that component. In addition, if you add further components to your computer that require this hotfix, you must install the hotfix again. Fixes included in a service pack do not work the same way. After you install a service pack, fixes are applied to all components you add or reinstall without you having to reinstall the service pack." - MS hotfix deplyment guide.

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exdosAuthor Commented:
Sorry what I meant was O/S patches & critical updates  such as KB824146,  KB824141 etc.
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NeilDavisCommented:
I would try it on a test machine.  An updated version of Qchain is avaliabe that fixes some problems.  http://support.microsoft.com/default.aspx?kbid=815062
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exdosAuthor Commented:
war1
"already installed would that cause any complications"
did you mean
"already installed would not that cause any complications"
if so then my problem is solved!
Thanks
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war1Commented:
exdos,  yes, I mean that the latter.  So you computer is running fine without complications after the install?  That is great.
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jcck2004Commented:
The patch is not being throughly tested, I would put them on a test machine (server) before install onto a mission critical system like the exchange or oracle database machine

service pack on the other hand is more throughly tested by Microsoft, there is less issue with it, but still test machine is the keep, what you may want to be more specific about is :

what OS do you have?
what serivice pack level you have?
what critical application you have running on that machine
can you accept system not booting up ?
do you have a complete backup ? (you should always, in case...)
you may want to use a ghosted machine to test

good software to try is the Shvlik NetChekPro, it has in depth study of the patches issued by microsoft,
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exdosAuthor Commented:
what OS do you have? XP
what serivice pack level you have? SP1a
what critical application you have running on that machine All machines apps run from app server baring a few ie MS office
can you accept system not booting up ? we are going to try it  on a one pc and ensure all there are no issues.
do you have a complete backup ? (you should always, in case...) always rule number one
you may want to use a ghosted machine to test,
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