If you installed Arcsoft yourself and do not have the installation CDs, you can continue to look for it, ask your friend for help, but let's say you never find it.
It looks like you can download Arcsoft from their World Wide Web site:http://www.arcsoft.com/estore/software_tit...roductCode=PI65
That would be their latest, you might see if they have a version 5 to download, if it costs anything for old versions, etc. If you bought a license, their technical support folks may have a way to help you.
Your "not responding" problem requires more information like your Windows version and Service Pack. To figure that out, click Start, Run and in the box enter:
click OK and report (at least) Version, Service Pack, Physical Memory.
When do you see this not responding message, does it happen always, sometimes, only when you do a certain thing, what do you do when it happens to get out of it...
A good idea is to help ensure your system is reasonably malware free as follows:
Download, install, update and do a full scan with these free malware detection programs:
Malwarebytes (MBAM): http://malwarebytes.org/
SUPERAntiSpyware: (SAS): http://www.superantispyware.com/