I really don't think you should be worried. but let me break it down
ISPs - Internet Service Provider - This is how you get your internet. Time Warner Cable, AT&T, Earthlink are some of the many ISPs out there. Changing ISPs doesn't do anything except raise/lower your internet cost.
Flash - Odd program? No. 90% of companies and end users (like yourself) use flash. Flash is used in creating websites, online games, ads, and even videos that you watch on the net. Flash is nothing new and is not harmful. It just lets you view stuff on the internet. Like my whole website is flash based. If u didn't have flash you wouldn't be able to view it. Flash is also used to create online photo galleries.
Linux - Hackers program? Most likely not. Linux is not an actual program its an OS (operating system). Linux is just like Windows but its by a different company. Linux actually is much safer then windows, it suffers from less internet attacks, less viruses, and less malware or none! its just an operating system.
If you recently bought a new pc. and if u think he is a hacker ill tell uthis he wouldnt need a new graphics card. hacking isn't about pretty graphics its about coding. Though if u bought a new graphics card. and he is wanting a better one he probably just wants to play recent games. I would not buy a new processor or graphics card. he will just have to wait till this one is outdated.
PERL - Practical Extraction and Reporting Language - Perl was first brought into being by Larry Wall circa 1987 as a general purpose Unix scripting language to make his programming work simpler. Many high-traffic websites, such as bbc.co.uk, Amazon.com, LiveJournal, Ticketmaster and IMDb[20] use Perl extensively.
Perl is often used as a glue language, tying together systems and interfaces that were not specifically designed to interoperate, and for "data munging", i.e., converting or processing large amounts of data for tasks like creating reports.
He might be compling and thats why he might be asking for a faster processor so he doesn't have to leave it on at night. Though he might be making the next best program that i might download someday. BUT he is not a hacker. Though FYI not all hackers are bad there are good hackers out there. and major companies hire these hackers to hack into their own websites to secure them better. I wouldn't worry.
But talk to him see what he is making. be interested in him and not scared of him.