public class ProductRenewalInformationPageController {
	public account a {get;set;}
	public Boolean editMode {get;set;}
	public Boolean editAccess {get;set;}
	public Boolean isAdmin {get;set;}

	public productRenewalInformationPageController(ApexPages.standardController std){

		editMode = false;
		if(a == null) a = [
		SELECT name, OwnerId, CreatedDate, Product_Domain_Protect__c, Product_EIS_Gold__c, Product_EIS_Platinum__c,
		Product_Certification__c, Product_Additional_AM_Services__c,Product_Email_Client_Monitor__c, Product_Professional_Services__c,
		Product_EIS_Internal_Use__c, Product_General_Referral__c,Product_EIS_Child__c, Product_Tools_Reseller_API__c, Product_Cert_Referral_Framework__c,
		Product_Certification_Referral_Child__c, Product_Tools_Reseller_Framework__c,Product_Inbox_Insight__c, Product_Email_Brand_Monitor__c, Product_Email_Brand_Monitor_Child__c,
		Product_Domain_Protect_Child__c, Product_Domain_Secure__c, Product_Domain_Secure_Child__c
		FROM account WHERE id = :ApexPages.currentPage().getParameters().get('id')
		];

		//determine if user can make changes

		user u =[select id, profile.name from user where id = :userinfo.getuserid()];

		if(u.profile.name == 'Exec Admin' || u.profile.name == 'Finance'){
		isAdmin = true;
		} else {isAdmin = false;}

		if(isAdmin == true){
		editAccess = true;
		} else {editAccess = false;}

	// only proceed if the user has edit rights
		if(editAccess == true) {

		//editMode is used as a view state variable (only Admin and Finance can edit) Initializes as false but once true page rerenders to display inputfields rather than output fields
			if(editMode == false) {
			editMode = true;
			} else {
				// this part of the code is where any values that were entered by the use are saved
				editMode = false;

				update a;

			} else {
				if(editAccess == false) ApexPages.addMessage (new ApexPages.Message(ApexPages.Severity.ERROR,'You are not authorized to make changes to this page.'));

			}

		}
		return null;
	}
	public PageReference save() {
		update a;
		return (new ApexPages.StandardController(account)).view();
	}
}

Several bugs... = instead of ==, mismatched braces... here's my best guess for your code...