you should let it run for at LEAST 2 hours...it will run until you press the escape key and in mission critical systems you would let it run for 2 days...if it shows any errors during that time the ram has to be replaced...if its not your ram ...
I went back over this whole thread...found this...
this is from your 1st post in this topic
2. On shutdown, before a hard power down, a dialog box is displayed with the error “svchost.exe error on shutdown. The instruction as "0x73d223b5" referenced memory at "0x73d223b5". The memory could not be "written".
then this in post number #30 on page 2
Header : 'svchost.exe - Application Error''The instruction at "0x76ce2ec1" referenced memory are "0x76ce2ec1". The memory could not be "written".
and you got this several times trying the repair..
Setup failed to install the product catalogs. This is a fatal error. The setup log files should contain more information.'
you will need to run the repair again and this time borrow a OEM or retail xp cd of the same flavor you have installed...IE if you have XP PRO installed the cd you borrow HAS to be XP PRO