Mr. lswartz & Mr. holmes4, Thank you for your respond and I really appreciate your reply and recommendations
I already have Ubuntu OS and I upgraded it, but I feel Ubuntu needs more work to be comprehensive and make it contains all the features that can run all types of files that run in MS OS and Mac iOS. On other hand, I like Ubuntu system because it's strong with networking and it's secure.
Mr. holmes4 (Steve)
I want to install Windows OS because of the work, but I'm confused between Windows 7 and Windows 8 (or Windows 8.1). As I read online, I found Windows 8 (or Windows 8.1) is faster than Windows 7 because it's suitable for tablets to support touchscreens and Windows 8 (or Windows 8.1) has antivirus built-in (Windows Defender), but Windows 8 (or Windows 8.1) has problems.
Do I need to install another antivirus program?
What about Kaspersky antivirus program ?
Which edition of Windows is better for my dell mini (Home edition, Professional edition, or Ultimate edition)? from your experience
Which system type of Windows 32 or 64?
Can I upgrade the memory to 4GB, 6GB, or 8GB?
Btw, my laptop doesn't have sim card slot. Can I add the slot to insert the sim card ?
THANK YOU again guys