I've never encountered problems installing Pro Tools on my computer, however careful to make updates iLoks if you do not want any surprises (message admin).
HP Windows 7 64-bit, 4GB RAM, 1TB HDD memory in two dedicated external sound card fast track ultra
The software works properly train to use some plug-ins gourdmands (izotope RX2 to name it)
I use Pro Tools for over 4 years, different versions, all equally stable. I tried free suites (audacity, magix music maker) before investing. The only problem is the grip advanced training in use are more than necessary to take advantage of the beast