What is wrong with my computer?

I recently (end of April 2011) bought an Acer Aspire laptop. A few days later I went and bought a printer. When I set up the printer (and put the disk in) it didn't start up, but somehow used a back door to be able to print. So fast forward to today, I went to print again and even though the printer was on, my computer was telling me it was offline. I called HP and spent over an hour and a half speaking with them about getting everything to set up properly. Needless to say, no matter what we did (from turning off ALL virus programs etc) NOTHING would let me install the start up program for my printer. We tried all sorts of things, from downloading it from HP directly, trying my disk etc. They told me it was a computer issue and to contact ACER directly. Well I contacted ACER and was told for them to even ATTEMPT to fix my computer, I would have to pay a software warranty for $149.99. I've decided that after spending $300 on this computer, and even more on accessories, I will NOT pay them to help me with something that was clearly an issue from the start. I was going to do a system restore, but at this point, that won't do any good since only a few days after I bought the computer, it wouldn't load this software correctly. I'm at a loss of what to do. Not only a week ago my computer refused to hook up to my wireless internet...after dealing with the cable company and then the router company, they found that it was my computer. I called ACER about the issues and they said because my 30 day McAFEE was expiring (not for 11 days) it wouldn't allow me on the internet anymore and that I had to uninstall that and go buy another anti virus program. I did that, and while it fixed it for a couple days, I had more issues with the internet as well. I'm really unsure of what to do at this point...people at ACER will not waive the fees for me and provide me with any help unless I pay some outrageous fee. I really love this laptop and its perfect for what I want to do, it all just started because I wanted to print something. Thankfully HP told me a back door on how to print, but will have to do tons of stuff before I'm able to print on a regular basis. I just feel if I can't even have the start up wizard start for my hp printer, then lord only knows what other problems will arise on this computer. On a side note, I'm on windows 7 and EVERYTHING (updates/anti virus etc.) is up to date and there are no issues according to the computer. Any help is appreciated and I can try to answer any questions to help someone solve this issue. I have tried to disable everything on my computer to get this start up wizard to install, and it still hasn't. Another note: I bought a tablet and when I put the CD in to install it did without any issues at all. It just seems this printer won't install either manually or through the CD. Thank you.