deleting parallels

[pleasehelp!]

M

 

[simsaladimbamba]

Model Name: MacBook
Model Identifier: MacBook3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 800 MHz

How do I restore previous settings? I deleted Parallels bc it was slowing down the computer post installation, but the computer is still slow.

Best way to FULLY DELETE a program
+
Performance Tips For Mac OS X​

Also when I turnoin the computer I still get the message about needing appropriate boot disk to start unless I hold down the option button while turning the computer. It has been this way since I installed Parallels. I do not think I partitioned the drive when I installed Parallels. See below.

Go to System Preferences > Startup Disk* and select your Macintosh HD volume.

Is it possible I have a virus?

No.

Currently there are zero viruses affecting Mac OS X in public circulation, but there are other kinds of malware existing, that can infect your Mac.
To learn more about malware in Mac OS X and what steps can be taken to protect yourself, read the following F.A.Q.:

Mac Virus/Malware Info by GGJstudios​