There are a couple of things to check:
1) That your computer is not infected with a virus
2) That your hard drive is not getting full. More than half full and you would likely see some degradation in performance.
3) That your hard drive is not badly fragmented. Windows has a utility to check and fix this.
4) That your hard drive is not failing, causing multiple re-reads and re-writes. Again, Windows has a utility to check this.
5) Try setting your preview windows to a lower quality preview and see if this helps.
There may be other things as well, but these are just a few that spring to mind.
HTH Scott Hendry
www.scotthendry.com
YouTube username TheCscottHendry

Scott, thanks for your reply..I did defragment it today, checked for viruses , deleted many but still its acting the same.When i checked the taskmaster it had it 100 percent on cpu and a lot of memory was taken up.I think also im using music software the PC cant handle it..maybe.Im not a tech wiz..I might just have to get another PC just to use this programme is another option Thanks

The problem you described is that the program is "going slower and slower". Did it ever perform to your satisfaction on your computer? If the answer is yes, then your computer is sufficient to run the program, you just have to find out what is causing the high CPU usage. Windows utilities are your friend here. If you look at the resources monitor, you should be able to see which processes are utilising the CPU the most and what program those processes are associated with. What happens then, is up to you. In my experience, viruses are quite likely to use up lots of system resources such as CPU time, memory and disk space. Getting rid of the really nasty viruses can sometimes be difficult. Things like rootkits are difficult for anti virus programs to detect and remove. If you sometimes visit websites that could be a little shady, you should invest in a very good anti virus program. Scott Hendry
www.scotthendry.com
YouTube username TheCscottHendry

Scott , you maybe right it could be a virus even though i strictly dont visit shady sites on this pc as this is for my music work but on the other one i do and that working perfectly fine lol .. When I was using powerdirector 12 it was ok then when i went to 14 there were some issues but as what its turned into the last week or so..Im going to check it out or get it checked out and find out if its a hidden virus thanks