Hi andreandr
Not the fastest pc specs but 4 hours is a still a bit much.
Check and make sure all your drives are in DMA mode and not PIO - current transfer mode needs to have DMA also. Here's a guide.
Have you done a disc cleanup and defrag very recently? If not do that too - should do on a regular basis anyhow to help keep the pc running smooth.
Might also want to see if any of the quality enhancements are checked in Shrink - can improve quality but will take longer.
When you click backup click on the quality tab to check.
I might suggest to try closing any non-essential programs, like anti-virus and anti-spyware programs. This may slow it down also. Also, don't multi-task while running Shrink. This will slow it down considerably also. Good Luck!
AV and spyware programs are not gonna slow shrink down to 4 hours, sounds like DMA and PIO issue to me. Follow Binkie's advice. You might also check in the burn window (Options)that you don't have run Shrink set to: run back up in low priority mode!.
All the above. ;) 4 hours sounds long, check the DMA. With a slow processor and only 512MB RAM an XP system with AV can easily start paging (using virtual memory on the hard drive), which will slow things down. My XP system has a 400+ MB requirement at idle with the background apps. Checking the taskmanager should give a clue on that. Definitely don't try to multitask while doing a backup with that system. Being disconnected from the net, it can only help by turning off the AV and second party firewall if you have them.
@dean69
find out where shrink is saving all those shrunken files (the folder) and DELETE them. Then defrag your HDD. If you don't know how to do that then you probably shouldn't be using that pc. Google defragment hard drive and learn how to do something on your own.